A Certified React JS Developer course from Zero to Hero typically covers everything from basic JavaScript concepts to advanced React features. Here a comprehensive roadmap of topics covered in such a course:

1. Introduction to Web Development & JavaScript Basics

What is Web Development?

Frontend vs Backend Development

Introduction to HTML, CSS, and JavaScript (JS)

ES6+ Features: let, const, arrow functions, template literals, destructuring, spread/rest operators

Promises, Async/Await, Callbacks

DOM Manipulation & Event Handling

2. Getting Started with React

What is React? Why use React?

Setting up a React Development Environment

Understanding JSX (JavaScript XML)

Functional Components vs Class Components

React Developer Tools & Debugging

3. React Core Concepts

Props & State Management

Handling Events in React

Conditional Rendering

Lists & Keys in React

Controlled vs Uncontrolled Components

Forms & Form Validation in React

4. React Hooks (Modern React)

Understanding Hooks: Why Hooks?

useState, useEffect Hook (State & Side Effects)

useRef, useMemo, useCallback

Custom Hooks

Rules of Hooks

5. React Router (Navigation in React)

Introduction to React Router

Dynamic Routing & Route Parameters

Nested Routes & Redirects

Protected Routes & Authentication Handling

6. State Management in React

Local Component State

Context API vs Prop Drilling

Redux for State Management

Introduction to Redux

Actions, Reducers, and Store

Redux Toolkit

Middleware (Redux Thunk & Redux Saga)

7. Handling APIs & Backend Communication

Fetching Data with fetch API & Axios

RESTful API Calls

Handling HTTP Requests (GET, POST, PUT, DELETE)

Error Handling & Loading States

Working with GraphQL in React

8. Advanced React Concepts

Higher Order Components (HOC)

React Portals

Error Boundaries

Code Splitting & Lazy Loading (React.lazy, Suspense)

React Fragments & Strict Mode

9. Performance Optimization in React

React.memo for Component Memoization

Use of useMemo & useCallback

Virtualization Techniques

Optimizing Large Lists with React Window

10. Styling in React

CSS Modules

Styled Components

Tailwind CSS in React

Material-UI & Bootstrap Integration

11. Testing in React

Introduction to Testing

Unit Testing with Jest

Component Testing with React Testing Library

End-to-End (E2E) Testing with Cypress

12. React and TypeScript

Introduction to TypeScript

Setting up a React Project with TypeScript

TypeScript Interfaces & Types

Prop Types & Default Props

13. Building & Deploying React Applications

Webpack & Babel Overview

Creating a Production Build

Deploying React App to:

Vercel, Netlify, Firebase

AWS, Heroku, GitHub Pages

14. Next.js for Server-Side Rendering (SSR)

Introduction to Next.js

Static Site Generation (SSG) vs SSR

API Routes in Next.js

Incremental Static Regeneration (ISR)

15. Real-World Project & Certification Exam

Full-Stack Project: React + Node.js + MongoDB/MySQL

Authentication with JWT & OAuth

Integrating Payments (Stripe, PayPal)

Role-Based Access Control

Certification Exam & Final Assessment