متاح الآن! بحث تيليغرام 2025 — أهم رؤى العام 
Web Development - HTML, CSS & JavaScript
الذهاب إلى القناة على Telegram
Learn to code and become a Web Developer with HTML, CSS, JavaScript , Reactjs, Wordpress, PHP, Mern & Nodejs knowledge Managed by: @love_data
إظهار المزيد📈 نظرة تحليلية على قناة تيليجرام Web Development - HTML, CSS & JavaScript
تُعد قناة Web Development - HTML, CSS & JavaScript (@javascript_courses) في القطاع اللغوي الإنكليزية لاعباً نشطاً. يضم المجتمع حالياً 54 712 مشتركاً، محتلاً المرتبة 2 430 في فئة التكنولوجيات والتطبيقات والمرتبة 6 847 في منطقة الهند.
📊 مؤشرات الجمهور والحراك
منذ تأسيسه في невідомо، حقق المشروع نمواً سريعاً وجمع 54 712 مشتركاً.
بحسب آخر البيانات بتاريخ 04 يونيو, 2026، تحافظ القناة على نشاط مستقر. خلال آخر 30 يوماً تغيّر عدد الأعضاء بمقدار 238، وفي آخر 24 ساعة بمقدار 35، مع بقاء الوصول العام مرتفعاً.
- حالة التحقق: غير موثّقة
- معدل التفاعل (ER): يبلغ متوسط تفاعل الجمهور 3.50%. وخلال أول 24 ساعة من النشر يحصد المحتوى عادةً 1.35% من ردود الفعل نسبةً إلى إجمالي المشتركين.
- وصول المنشورات: يحصل كل منشور على متوسط 1 913 مشاهدة. وخلال اليوم الأول يجمع عادةً 741 مشاهدة.
- التفاعلات والاستجابة: يتفاعل الجمهور بانتظام؛ متوسط التفاعلات لكل منشور يبلغ 4.
- الاهتمامات الموضوعية: يركز المحتوى على مواضيع رئيسية مثل javascript, css, object, html, array.
📝 الوصف وسياسة المحتوى
يصف المؤلف القناة بأنها مساحة للتعبير عن الآراء الذاتية:
“Learn to code and become a Web Developer with HTML, CSS, JavaScript , Reactjs, Wordpress, PHP, Mern & Nodejs knowledge
Managed by: @love_data”
بفضل وتيرة التحديث المرتفعة (أحدث البيانات بتاريخ 05 يونيو, 2026) تحافظ القناة على حداثتها ومستوى وصول مرتفع. وتُظهر التحليلات تفاعلاً نشطاً من الجمهور، ما يجعلها نقطة تأثير مهمة ضمن فئة التكنولوجيات والتطبيقات.
54 712
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+1097 أيام
+23830 أيام
جاري تحميل البيانات...
القنوات المماثلة
سحابة العلامات
الإشارات الواردة والصادرة
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جذب المشتركين
يونيو '26
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| التاريخ | نمو المشتركين | الإشارات | القنوات | |
| 05 يونيو | +2 | |||
| 04 يونيو | +40 | |||
| 03 يونيو | +27 | |||
| 02 يونيو | +16 | |||
| 01 يونيو | +13 |
منشورات القناة
class PubSub {
constructor() {
this.events = {};
}
subscribe(event, callback) {
if (!this.events[event]) {
this.events[event] = [];
}
this.events[event].push(callback);
}
publish(event, data) {
if (this.events[event]) {
this.events[event].forEach(callback => {
callback(data);
});
}
}
}
const pubsub = new PubSub();
pubsub.subscribe("message", data => {
console.log(data);
});
pubsub.publish("message", "Hello World");
| 2 | 🚀 JavaScript Interview Questions with Answers: Part-10
91. Write a function to find the sum of an array.
Using reduce()
function sumArray(arr) {
return arr.reduce((total, num) => total + num, 0);
}
console.log(sumArray([1, 2, 3, 4]));
Output:
10
Using Loop
function sumArray(arr) {
let sum = 0;
for (let num of arr) {
sum += num;
}
return sum;
}
92. Write a function to reverse a string.
Using split(), reverse(), join()
function reverseString(str) {
return str.split("").reverse().join("");
}
console.log(reverseString("hello"));
Output:
olleh
Using Loop
function reverseString(str) {
let reversed = "";
for (let i = str.length - 1; i >= 0; i--) {
reversed += str[i];
}
return reversed;
}
93. Write a function to find the largest number in an array.
Using Math.max()
function largestNumber(arr) {
return Math.max(...arr);
}
console.log(largestNumber([2, 8, 5, 1]));
Output:
8
Using Loop
function largestNumber(arr) {
let largest = arr[0];
for (let num of arr) {
if (num > largest) {
largest = num;
}
}
return largest;
}
94. Write a function to check if a string is a palindrome.
A palindrome reads same forward and backward.
Example:
function isPalindrome(str) {
const reversed = str.split("").reverse().join("");
return str === reversed;
}
console.log(isPalindrome("madam"));
Output:
true
Case-Insensitive Version
function isPalindrome(str) {
str = str.toLowerCase();
return str === str.split("").reverse().join("");
}
95. Write a function to remove duplicates from an array.
Using Set
function removeDuplicates(arr) {
return [...new Set(arr)];
}
console.log(removeDuplicates([1, 2, 2, 3, 4, 4]));
Output:
[1, 2, 3, 4]
Using filter()
function removeDuplicates(arr) {
return arr.filter((item, index) =>
arr.indexOf(item) === index
);
}
96. Write a function to implement debounce.
Debouncing delays execution until the user stops triggering events.
Example:
function debounce(fn, delay) {
let timer;
return function(...args) {
clearTimeout(timer);
timer = setTimeout(() => {
fn.apply(this, args);
}, delay);
};
}
Usage:
const search = debounce(() => {
console.log("Searching...");
}, 500);
Common Uses:
• Search bars
• Resize events
• Auto-save
97. Write a function to implement throttle.
Throttling limits execution frequency.
Example:
function throttle(fn, delay) {
let lastCall = 0;
return function(...args) {
const now = Date.now();
if (now - lastCall >= delay) {
lastCall = now;
fn.apply(this, args);
}
};
}
Usage:
const scrollHandler = throttle(() => {
console.log("Scrolling...");
}, 1000);
Common Uses:
• Scroll events
• Mouse movement
• Window resizing
98. Write a function to flatten a nested array.
Using flat()
function flattenArray(arr) {
return arr.flat(Infinity);
}
console.log(flattenArray([1, [2, [3, 4]]]));
Output:
[1, 2, 3, 4]
Recursive Solution
function flattenArray(arr) {
let result = [];
for (let item of arr) {
if (Array.isArray(item)) {
result = result.concat(flattenArray(item));
} else {
result.push(item);
}
}
return result;
}
99. Write a function to implement a simple pub/sub pattern.
Example: | 563 |
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| 4 | Frontend Development Project Ideas ✅
1️⃣ Beginner Frontend Projects 🌱
• Personal Portfolio Website
• Landing Page Design
• To-Do List (Local Storage)
• Calculator using HTML, CSS, JavaScript
• Quiz Application
2️⃣ JavaScript Practice Projects ⚡
• Stopwatch / Countdown Timer
• Random Quote Generator
• Typing Speed Test
• Image Slider / Carousel
• Form Validation Project
3️⃣ API Based Frontend Projects 🌐
• Weather App using API
• Movie Search App
• Cryptocurrency Price Tracker
• News App using Public API
• Recipe Finder App
4️⃣ React / Modern Framework Projects ⚛️
• Notes App with Local Storage
• Task Management App
• Blog UI with Routing
• Expense Tracker with Charts
• Admin Dashboard
5️⃣ UI/UX Focused Projects 🎨
• Interactive Resume Builder
• Drag Drop Kanban Board
• Theme Switcher (Dark/Light Mode)
• Animated Landing Page
• E-Commerce Product UI
6️⃣ Real-Time Frontend Projects ⏱️
• Chat Application UI
• Live Polling App
• Real-Time Notification Panel
• Collaborative Whiteboard
• Multiplayer Quiz Interface
7️⃣ Advanced Frontend Projects 🚀
• Social Media Feed UI (Instagram/LinkedIn Clone)
• Video Streaming UI (YouTube Clone)
• Online Code Editor UI
• SaaS Dashboard Interface
• Real-Time Collaboration Tool
8️⃣ Portfolio Level / Unique Projects ⭐
• Developer Community UI
• Remote Job Listing Platform UI
• Freelancer Marketplace UI
• Productivity Tracking Dashboard
• Learning Management System UI
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| 8 | 79. How do you optimize heavy loops or renders?
Common Optimization Techniques:
1. Avoid unnecessary DOM updates
2. Use memoization
3. Use efficient loops
4. Cache repeated calculations
5. Use virtual DOM frameworks
6. Minimize reflows/repaints
Example:
Cache DOM selector:
const element = document.getElementById("box");
for(let i = 0; i < 1000; i++) {
element.innerHTML = i;
}
Why?
Repeated DOM lookups are expensive.
80. How do you handle memory leaks?
Memory leaks happen when unused memory is not released.
Common Causes:
• Unremoved event listeners
• Global variables
• Timers not cleared
• Detached DOM elements
• Closures holding unused references
Example:
const interval = setInterval(() => {
console.log("Running");
}, 1000);
clearInterval(interval);
Best Practices:
• Remove listeners
• Clear timers
• Avoid unnecessary global variables
• Nullify unused references
DevTools:
Browser memory profiling tools help detect leaks.
Double Tap ❤️ For Part-9 | 1 882 |
| 9 | 🚀 JavaScript Interview Questions with Answers — Part 8
71. What are try/catch/finally?
These are used for error handling in JavaScript.
Block
try
• Purpose: Code that may cause error
catch
• Purpose: Handles the error
finally
• Purpose: Always executes
Example:
try {
console.log(a);
} catch(error) {
console.log("Error occurred");
} finally {
console.log("Execution completed");
}
Output:
Error occurred
Execution completed
Important:
finally runs whether an error occurs or not.
72. What is the Error object?
The Error object contains information about runtime errors.
Example:
try {
throw new Error("Something went wrong");
} catch(error) {
console.log(error.message);
}
Common Error Properties:
name
• Description: Error type
message
• Description: Error message
stack
• Description: Stack trace
Built-in Error Types:
• ReferenceError
• TypeError
• SyntaxError
• RangeError
73. How do you create custom errors?
Using classes or extending Error.
Example:
class ValidationError extends Error {
constructor(message) {
super(message);
this.name = "ValidationError";
}
}
throw new ValidationError("Invalid input");
Benefits:
• Better debugging
• More meaningful error handling
74. What are console.log, console.table, console.group?
These are debugging methods available in browser DevTools.
console.log()
Prints normal output.
console.log("Hello");
console.table()
Displays data in table format.
console.table([
{name: "Deepak", age: 25},
{name: "John", age: 30}
]);
console.group()
Groups related logs.
console.group("User Info");
console.log("Name: Deepak");
console.log("Age: 25");
console.groupEnd();
Benefit:
Cleaner debugging in large applications.
75. How do you use breakpoints and the debugger?
Breakpoints pause code execution for debugging.
Using debugger:
function test() {
let x = 10;
debugger;
console.log(x);
}
test();
How It Works:
• Browser pauses at debugger
• Inspect variables and execution flow
Browser DevTools Features:
• Step through code
• Watch variables
• Inspect call stack
• Monitor network requests
Interview Tip:
Very important skill for frontend developers.
76. What is performance profiling in DevTools?
Performance profiling helps identify slow operations and bottlenecks.
Browser DevTools Can Measure:
• Rendering performance
• JavaScript execution time
• Memory usage
• FPS drops
Common Tabs:
• Performance
• Memory
• Network
Why It Matters:
Helps optimize web applications and improve user experience.
77. How do you avoid blocking the main thread?
Heavy tasks can freeze the UI because JavaScript is single-threaded.
Solutions:
1. Use asynchronous operations
2. Break heavy tasks into chunks
3. Use Web Workers
4. Use setTimeout()
5. Optimize loops
Example:
setTimeout(() => {
heavyTask();
}, 0);
Why?
Allows browser to handle UI updates before running heavy code.
78. What is debouncing vs throttling?
Both optimize frequent function calls.
Debouncing
Runs function only after user stops triggering event.
Example Use Cases:
• Search input
• Resize events
function debounce(fn, delay) {
let timer;
return function() {
clearTimeout(timer);
timer = setTimeout(() => {
fn();
}, delay);
};
}
Throttling
Limits function execution to fixed intervals.
Example Use Cases:
• Scroll events
• Mouse movement
function throttle(fn, delay) {
let lastCall = 0;
return function() {
let now = Date.now();
if (now - lastCall >= delay) {
lastCall = now;
fn();
}
};
}
Difference:
Debounce
• Waits after last event
• Reduces extra calls
Throttle
• Executes at intervals
• Limits execution frequency | 1 363 |
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| 11 | 💼 Web Development Resume & Portfolio Strategy
Now comes the most important part: turning your skills into job offers.
🧠 What Recruiters Actually Look For
Not certificates ❌, Not theory ❌. They want:
- Real projects
- Clear resume
- GitHub proof
- Ability to explain work
📄 1️⃣ Resume Strategy (High Impact)
- Header: Name + Contact + LinkedIn + GitHub
- Summary: 2–3 lines highlighting your skills
- Skills: List of relevant skills
- Projects: MOST IMPORTANT section
- Experience: If any
- Education
📰 Strong Summary Example
“Full Stack Developer (MERN) with hands-on experience building real-world applications including authentication, CRUD APIs, and deployment.”
🧠 Skills Section
Group properly:
- Frontend: React, JavaScript, HTML, CSS
- Backend: Node.js, Express
- Database: MongoDB
- Tools: Git, Postman, Vercel, Render
🚀 Projects Section (GAME CHANGER)
Each project must include:
- Project name
- Tech stack
- Features
- Live link + GitHub link
🧩 Example Project Entry
E-commerce MERN App
- Built using React, Node.js, MongoDB
- Features: Login, Cart, Payment integration
- REST APIs with JWT authentication
- Deployed on Vercel + Render
🌐 2️⃣ Portfolio Strategy
You need 1 simple portfolio website.
- About me
- Skills
- Projects
- Contact
🎯 Must-have sections
✔ Live project links
✔ GitHub links
✔ Clean UI
✔ Mobile responsive
🔥 Pro Tip
Don’t build 10 projects. Build 3 strong projects.
🧪 Top 3 Projects You MUST Have
- E-commerce App: Authentication, Product listing, Cart, CRUD APIs
- Dashboard App: Charts, Data visualization, API integration
- Full Stack CRUD App: Add/Edit/Delete, Backend + database, Deployment
🧠 3️⃣ GitHub Strategy
Your GitHub should show:
- Clean code
- README file
- Project explanation
- Screenshots
README must include:
- Project overview
- Features
- Tech stack
- Setup steps
🎯 4️⃣ Apply Smart (Not Hard)
Don’t spam applications. Instead:
- Apply to 10–15 jobs daily
- Customize resume
- Use LinkedIn + Naukri
- Message recruiters directly
💬 5️⃣ Interview Strategy
Be ready to explain:
- Your project flow
- MERN architecture
- API working
- Authentication logic
⚠️ Common Mistakes
- No live projects ❌
- Weak GitHub ❌
- Generic resume ❌
- No project explanation ❌
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If you can:
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✅ Deploy project
✅ Answer basics
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🧪 Mini Task
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- Upload to GitHub
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- Add to resume
Double Tap ❤️ For More | 1 508 |
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| 13 | 🔥 A-Z Backend Development Roadmap 🖥️🧠
1. Internet & HTTP Basics 🌐
- How the web works (client-server model)
- HTTP methods (GET, POST, PUT, DELETE)
- Status codes
- RESTful principles
2. Programming Language (Pick One) 💻
- JavaScript (Node.js)
- Python (Flask/Django)
- Java (Spring Boot)
- PHP (Laravel)
- Ruby (Rails)
3. Package Managers 📦
- npm (Node.js)
- pip (Python)
- Maven/Gradle (Java)
4. Databases 🗄️
- SQL: PostgreSQL, MySQL
- NoSQL: MongoDB, Redis
- CRUD operations
- Joins, Indexing, Normalization
5. ORMs (Object Relational Mapping) 🔗
- Sequelize (Node.js)
- SQLAlchemy (Python)
- Hibernate (Java)
- Mongoose (MongoDB)
6. Authentication & Authorization 🔐
- Session vs JWT
- OAuth 2.0
- Role-based access
- Passport.js / Firebase Auth / Auth0
7. APIs & Web Services 📡
- REST API design
- GraphQL basics
- API documentation (Swagger, Postman)
8. Server & Frameworks 🚀
- Node.js with Express.js
- Django or Flask
- Spring Boot
- NestJS
9. File Handling & Uploads 📁
- File system basics
- Multer (Node.js), Django Media
10. Error Handling & Logging 🐞
- Try/catch, middleware errors
- Winston, Morgan (Node.js)
- Sentry, LogRocket
11. Testing & Debugging 🧪
- Unit testing (Jest, Mocha, PyTest)
- Postman for API testing
- Debuggers
12. Real-Time Communication 💬
- WebSockets
- Socket.io (Node.js)
- Pub/Sub Models
13. Caching ⚡
- Redis
- In-memory caching
- CDN basics
14. Queues & Background Jobs ⏳
- RabbitMQ, Bull, Celery
- Asynchronous task handling
15. Security Best Practices 🛡️
- Input validation
- Rate limiting
- HTTPS, CORS
- SQL injection prevention
16. CI/CD & DevOps Basics ⚙️
- GitHub Actions, GitLab CI
- Docker basics
- Environment variables
- .env and config management
17. Cloud & Deployment ☁️
- Vercel, Render, Railway
- AWS (EC2, S3, RDS)
- Heroku, DigitalOcean
18. Documentation & Code Quality 📝
- Clean code practices
- Commenting & README.md
- Swagger/OpenAPI
19. Project Ideas 💡
- Blog backend
- RESTful API for a todo app
- Authentication system
- E-commerce backend
- File upload service
- Chat server
20. Interview Prep 🧑💻
- System design basics
- DB schema design
- REST vs GraphQL
- Real-world scenarios
🚀 Top Resources to Learn Backend Development 📚
• MDN Web Docs
• Roadmap.sh
• FreeCodeCamp
• Backend Masters
• Traversy Media – YouTube
• CodeWithHarry – YouTube
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| 15 | 48. What is event.target vs event.currentTarget?
Property: event.target → Meaning: Actual clicked element
Property: event.currentTarget → Meaning: Element handling the event
Example:
parent.addEventListener("click", function(event) {
console.log(event.target);
console.log(event.currentTarget);
});
Important:
In event delegation, target is very useful.
49. How do you prevent default behavior?
Using:
event.preventDefault();
Example:
Prevent form submission.
form.addEventListener("submit", function(event) {
event.preventDefault();
console.log("Form prevented");
});
Common Uses:
• Prevent page reload
• Prevent link navigation
• Custom form handling
50. How do you remove an event listener?
Using:
removeEventListener()
Example:
function handleClick() {
console.log("Clicked");
}
button.addEventListener("click", handleClick);
button.removeEventListener("click", handleClick);
Important:
The same function reference must be used while removing the listener.
Wrong Example:
button.removeEventListener("click", () => {});
This will not work because it creates a new function reference.
Double Tap ❤️ For Part-6 | 2 578 |
| 16 | Sure! Here’s the modified version with * replaced by **:
🚀 JavaScript Interview Questions with Answers — Part 5
41. What is the DOM?
DOM stands for:
Document Object Model
It is a programming interface that represents an HTML document as a tree structure so JavaScript can access and manipulate webpage elements.
Example HTML:
<h1 id="title">Hello</h1>
JavaScript:
const heading = document.getElementById("title");
console.log(heading);
What You Can Do With DOM:
• Change text/content
• Change styles
• Add/remove elements
• Handle events
• Create interactive webpages
42. How do you select an element by id, class, or tag?
Select by ID
document.getElementById("title");
Select by Class
document.getElementsByClassName("box");
Select by Tag
document.getElementsByTagName("p");
Modern Selectors
querySelector()
Returns first matching element.
document.querySelector(".box");
querySelectorAll()
Returns all matching elements.
document.querySelectorAll(".box");
Interview Tip:
querySelector() is commonly used in modern JavaScript.
43. How do you change element text or HTML?
Change Text
Using textContent
const heading = document.getElementById("title");
heading.textContent = "Welcome";
Change HTML
Using innerHTML
heading.innerHTML = "<span>Hello</span>";
Difference:
Property: textContent → Purpose: Plain text only
Property: innerHTML → Purpose: HTML content
Important:
Avoid unsafe innerHTML with user input because of XSS security risks.
44. How do you add/remove/replace a DOM element?
Create Element
const div = document.createElement("div");
div.textContent = "New Element";
Add Element
document.body.appendChild(div);
Remove Element
div.remove();
Replace Element
const newElement = document.createElement("p");
newElement.textContent = "Updated";
div.replaceWith(newElement);
45. How do you listen to click, keyup, etc.?
Using addEventListener().
Click Event
const button = document.querySelector("button");
button.addEventListener("click", () => {
console.log("Button clicked");
});
Keyup Event
const input = document.querySelector("input");
input.addEventListener("keyup", () => {
console.log("Key released");
});
Common Events:
Event: click → Purpose: Mouse click
Event: keyup → Purpose: Key released
Event: keydown → Purpose: Key pressed
Event: submit → Purpose: Form submit
Event: mouseover → Purpose: Mouse hover
46. What is event delegation?
Event delegation is a technique where a parent element handles events for its child elements using event bubbling.
Example:
document.getElementById("list")
.addEventListener("click", function(event) {
if (event.target.tagName === "LI") {
console.log(event.target.textContent);
}
});
Benefits:
• Better performance
• Fewer event listeners
• Works for dynamically added elements
Interview Tip:
Very important concept in frontend interviews.
47. What is event bubbling vs capturing?
Events move through the DOM in two phases.
Event Bubbling
Event travels from child → parent.
Event Capturing
Event travels from parent → child.
Example:
div.addEventListener("click", () => {
console.log("Div clicked");
});
button.addEventListener("click", () => {
console.log("Button clicked");
});
If button clicked:
Button clicked
Div clicked
Enable Capturing:
div.addEventListener("click", handler, true);
Default:
JavaScript uses bubbling by default. | 2 087 |
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| 18 | 🎯 Tech Career Tracks What You’ll Work With 🚀👨💻
💡 1. Data Scientist
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▶️ Skills: Statistics, Machine Learning, Data Wrangling
▶️ Tools: Pandas, NumPy, Scikit-learn, Jupyter
▶️ Projects: Predictive models, sentiment analysis, dashboards
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▶️ Tools: TensorFlow, PyTorch, MLflow
▶️ Skills: Feature engineering, model tuning
▶️ Projects: Image classifiers, recommendation systems
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▶️ Platforms: AWS, Azure, GCP
▶️ Tools: Terraform, Ansible, Docker, Kubernetes
▶️ Skills: Cloud architecture, networking, automation
▶️ Projects: Scalable apps, serverless functions
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▶️ Concepts: Network Security, Vulnerability Assessment
▶️ Tools: Wireshark, Burp Suite, Nmap
▶️ Skills: Threat detection, penetration testing
▶️ Projects: Security audits, firewall setup
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▶️ Engines: Unity, Unreal Engine
▶️ Skills: Physics, animation, design patterns
▶️ Projects: 2D/3D games, multiplayer games
💼 7. Tech Product Manager
▶️ Skills: Agile, Roadmaps, Prioritization
▶️ Tools: Jira, Trello, Notion, Figma
▶️ Background: Business + basic tech knowledge
▶️ Projects: MVPs, user stories, stakeholder reports
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