I’ve designed it to go from Beginner → Intermediate → Advanced → Senior/System Design, exactly how interview preparation should flow.

🚀 React Interview Questions Series – Complete Roadmap

🟢 PHASE 1: React Fundamentals (Beginner Level)

👉 Goal: Clear basic React interviews

Day 1: React Basics

What is React?
Why React is used?
React vs Angular vs Vue
SPA vs MPA

Day 2: JSX & Rendering

What is JSX?
JSX vs HTML
How JSX is converted to JS
Babel role

Day 3: Components

Functional vs Class components
Why functional components are preferred
Component reusability

Day 4: Props & State

What are props?
What is state?
Props vs State
Immutable state concept

Day 5: Events & Conditional Rendering

Event handling in React
Synthetic events
Conditional rendering patterns

🟡 PHASE 2: Core React Concepts (Intermediate Level)

👉 Goal: Crack mid-level React interviews

Day 6: React Hooks – Introduction

What are Hooks?
Why Hooks were introduced
Rules of Hooks

Day 7: useState & useEffect (Most Asked)

useState working
useEffect lifecycle
Dependency array
Common mistakes

Day 8: Other Important Hooks

useContext
useRef
useMemo
useCallback
When to use which hook

Day 9: Component Lifecycle (Interview Favorite)

Lifecycle methods (old vs hooks)
Mounting, Updating, Unmounting
Cleanup functions

Day 10: Forms & Controlled Components

Controlled vs uncontrolled components
Form handling
Validation basics

🟠 PHASE 3: Performance & Optimization (Advanced Level)

👉 Goal: Stand out as a strong React engineer

Day 11: React Rendering & Reconciliation

Virtual DOM
Diffing algorithm
Re-rendering triggers

Day 12: Performance Optimization

React.memo
useMemo vs useCallback
Lazy loading
Code splitting

Day 13: Keys & Lists

Why keys are important
Index as key – why dangerous
Reconciliation issues

Day 14: Error Handling

Error boundaries
try/catch limitations
Production error handling

🔵 PHASE 4: State Management (Advanced Interviews)

👉 Goal: Crack product company interviews

Day 15: State Management Basics

Lifting state up
Prop drilling problem
Context API

Day 16: Redux Interview Questions

Why Redux?
Redux flow
Actions, reducers, store
Redux vs Context

Day 17: Modern Redux

Redux Toolkit
createSlice
Async thunk
RTK Query

🟣 PHASE 5: React & Backend Integration

Day 18: API Calls in React

fetch vs axios
useEffect with API
Error handling
Loading states

Day 19: Authentication & Authorization

JWT in React
Protected routes
Role-based UI
Token storage (localStorage vs cookies)

Day 20: Environment & Config

.env files
Build-time vs runtime config

🔴 PHASE 6: Advanced React + System Design (Senior Level)

👉 Goal: Senior / Lead React roles

Day 21: React Architecture Design

Folder structure best practices
Feature-based architecture
Component vs container pattern

Day 22: React System Design Questions

Design a dashboard in React
Design large form-based app
Handling real-time updates

Day 23: React + Performance at Scale

Large lists (virtualization)
Memory leaks
Web workers

Day 24: React Security Questions

XSS in React
CSRF
Secure API calls
Sensitive data handling

⭐ PHASE 7: React Interview Special (Must-Have)

Day 25: Most Asked React Interview Questions

Why keys matter?
Why hooks can’t be conditional?
useEffect vs useLayoutEffect
State update batching

Day 26: React Coding Interview Questions

Build counter
Todo app
Debounce input
Infinite scroll

Video 27: React Interview Mistakes

Common mistakes candidates make
Resume traps
Live coding tips

🎯 Playlist Growth Strategy (YouTube Tip)

Start titles with:
“React Interview Questions – Part X”
Use thumbnails with:
- “Asked in Interviews”
- “Senior Level”
- “Must Know”
End each video with:
👉 “Next video: React Hooks Interview Questions”

🚀 Recommended First 5

React Interview Questions – Basics
Props vs State (Most Asked)
useEffect Explained (Interview Level)
React Hooks Interview Questions
Redux Interview Questions

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