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Frontend Development Interview Questions Beginner Level 1. What are semantic HTML tags? 2. Difference between id and class in HTML? 3. What is the Box Model in CSS? 4. Difference between margin and padding? 5. What is a responsive web design? 6. What is the use of the <meta viewport> tag? 7. Difference between inline, block, and inline-block elements? 8. What is the difference between == and === in JavaScript? 9. What are arrow functions in JavaScript? 10. What is DOM and how is it used? Intermediate Level 1. What are pseudo-classes and pseudo-elements in CSS? 2. How do media queries work in responsive design? 3. Difference between relative, absolute, fixed, and sticky positioning? 4. What is the event loop in JavaScript? 5. Explain closures in JavaScript with an example. 6. What are Promises and how do you handle errors with .catch()? 7. What is a higher-order function? 8. What is the difference between localStorage and sessionStorage? 9. How does this keyword work in different contexts? 10. What is JSX in React? Advanced Level 1. How does the virtual DOM work in React? 2. What are controlled vs uncontrolled components in React? 3. What is useMemo and when should you use it? 4. How do you optimize a large React app for performance? 5. What are React lifecycle methods (class-based) and their hook equivalents? 6. How does Redux work and when should you use it? 7. What is code splitting and why is it useful? 8. How do you secure a frontend app from XSS attacks? 9. Explain the concept of Server-Side Rendering (SSR) vs Client-Side Rendering (CSR). 10. What are Web Components and how do they work? @coding_interview_preparation

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The TRUTH About SOLID Principles: What Even Senior Devs Get Wrong! Which SOLID principle matters MOST? Here's my take: 1️⃣ SRP (Single Responsibility Principle): Start here! Each class should have ONE job. 2️⃣ DIP (Dependency Inversion Principle): Make code flexible. Don't depend on details! These give you instant benefits! Others (OCP & ISP) are for scaling. ❌ But STOP blindly following Liskov! It's about inheritance, and that's often a PROBLEM. ✅ Choose composition instead! Build things from smaller parts. SOLID's powerful, but don't blindly over-engineer! Simpler code is often BETTER.