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Web & Full-Stack Development2025-4 Edition100% Free Video Course

Don’t Imitate Understand – Understanding React

Understanding React is a React open source library course published by Don’t Imitate Understand Online Academy. React is a popular JavaScript library for building user interfaces, especially single-page applications where data changes over time. Developed and maintained by Facebook, React allows developers to build large web applications that can efficiently update and render in response to data changes. It is known for its simplicity, flexibility and performance. Its component-based architecture and extensive ecosystem make it the preferred choice for developing modern web applications and beyond.Designed for both React beginners and experienced React developers, this course will dive deep into React’s internals: the React source code itself, giving you a deep understanding of how React works. In this course, you will fully understand how React works, allowing you to use and debug React well. In this course, you will learn about topics such as the React element tree, fiber tree, JSX, Rendering, Reconciliation, State, Hooks, Effects, Suspense, React Server Components, etc. After completing this course, you will be able to use all the potential of React.

5.0
(6 reviews)
22 Hours On-Demand
Created by Senior Industry Specialist
Uploaded Sep 2026
English
Don’t Imitate Understand – Understanding React
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Course Features:
22 hours on-demand video
164 complete lectures
1 downloadable project zip file(s)
Streamable on mobile, tablet & desktop
Self-paced curriculum with progress tracking
Direct MP4 downloads & offline video access
Verified course archives hosted on cloud infrastructure.

What You'll Master in this Course

Concepts and principles of React open source library
Reconciliation
React Hooks
Debugging
And …

Course Curriculum164 Lectures

2 sections • 22 hours total length

Prefer offline learning? Download all 164 video lectures and project files for free.
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Introduction
Preview
2m
HTML and Trees
Preview
1m
The React Source Code
3m
A Basic React App
1m
Setup
2m
The DOM and Declarative Programming -
2m
HTML, The Browser, and the DOM
3m
React Elements -
2m
DOM Manipulation
6m
Conceptual Aside Imperative vs. Declarative Programming
2m
The DOM and Imperative Programming
3m
The DOM and Declarative Programming
5m
Conceptual Aside Recursion
4m
Conceptual Aside DOM Element References
2m
React Element Trees
6m
Conceptual Aside POJOs
15m
Creating React Elements
13m
React Elements and DOM Elements
8m
React DOM Updates
19m
Components
6m
Components and Reusability
14m
Conceptual Aside Pure Functions
7m
JSX -
2m
Element Properties
10m
Props
16m
Conceptual Aside Transformation
2m
Conceptual Aside Markup and Tree Creation Shorthand
1m
Template Logic
22m
Conceptual Aside HTML Authoring
2m
Fiber and Reconciliation -
2m
JSX and Thinking In Elements
17m
React Elements and JSX Links to for this lecture
23m
Fragment and HTML Authoring
13m
Conceptual Aside Trees and Linked Lists
5m
Conceptual Aside Tree Reconciliation and the Tree Edit Distance Problem
3m
Root Creation and render
16m
Fiber, Fiber Nodes, and Fiber Trees
8m
Execution Contexts -
2m
Work-In-Progress Nodes
11m
Reconciliation and Work
8m
Conceptual Aside Execution Contexts and the Event Loop
2m
Fiber and Custom Execution Contexts
5m
Units of Work and The Work Loop
3m
Conceptual Aside Equality
4m
React DOM and Rendering -
2m
Lanes and Priority
5m
Committing Work and The Renderer
4m
Beginning, Completing, Bailing Out and Pausing Work
12m
Mounting, Updating, and Unmounting
5m
Events -
2m
DOM Events
12m
React Event Objects
12m
State -
2m
Synthetic Event Properties and Methods
7m
Conceptual Aside Pure Functions (again)
2m
Conceptual Aside State Machines
5m
UI A Function of State
2m
Hooks and State -
2m
Fibers, Hooks, and State Extra Notes
4m
Conceptual Aside Reducers
7m
Conceptual Aside Queues
5m
Actions and State
9m
Update Queues
3m
State and Re-renders
2m
useState (Part 1)
6m
useReducer (Part 1)
10m
Rules of Hooks
7m
useReducer (Part 2)
8m
useState (Part 2)
12m
useState (Part 3)
13m
Adding Your Own Side Effects useEffect -
2m
Conceptual Aside Shallow Equality and Object.is
11m
Conceptual Aside Pure Functions and Side Effects
1m
Immutable State
9m
A Game of Ping Pong
2m
Adding Your Own Effects
13m
Dependencies
11m
Conceptual Aside Stale Closures
5m
Unmounting and Effects
12m
useEffect and Stale Closures
12m
useRef and forwardRef -
2m
Fetching Data...or not
12m
What Not to Do
12m
useRef and the DOM
6m
forwardRef
5m
useRef
4m
Custom Hooks -
2m
Component Design -
2m
useContext
2m
&&, 0, and Ternary Operators
14m
Extracting Custom Hooks
16m
Children
9m
Real World Complexity and Loops
26m
Lifting State Up
39m
Context with Caution
2m
useId and Key -
2m
Prop Drilling
5m
memo, useMemo, and useCallback -
2m
Key
18m
useId
12m
Conceptual Aside Memoization
8m
React Forget
1m
memo
21m
useContext and Reducer -
2m
Context
51m
useCallback
15m
Toolchains
2m
useMemo
32m
Conceptual Aside Toolchains
3m
Conceptual Aside ES Modules
7m
useContext + Reducer
40m
rd Party State Management
7m
Create React App
2m
Frameworks
4m
Strict Mode -
2m
Adding Strict Mode
5m
Forms -
2m
Extra Re-render
15m
Uncontrolled Inputs
7m
Extra Effect Re-run
13m
Vite
31m
Reorganizing Our App
22m
rd Party Form Help
2m
form
11m
textarea, select, and More
16m
Controlled Inputs
18m
Future Form Features
4m
React Dev Tools Lesson Summary -
2m
Using Dev Tools
4m
CSS and Components -
2m
CSS and React
4m
useDebugValue
2m
Toolchains and CSS
4m
CSS Modules and more
5m
Spelling Bee
1m
Class Project -
2m
HTML Authoring
2m
Getting the Data Promises, Async, and Await free YouTube video on my channel
7m
Header
12m
Shuffle
14m
Honeycomb
18m
Score
6m
Words and Letters
17m
Word List
19m
Highlighted Letter
7m
Meta-Frameworks -
2m
Final Thoughts
2m
NextJS
4m
Suspense and Frameworks
3m
Suspense -
2m
React Server Components
2m
Remix
3m
Suspense and Remix
14m
Composing Client and Server Components
9m
Server Components
11m
Client Components and 'use client'
6m
Conclusion
2m
RSC Payload
8m

Requirements

  • Basic enthusiasm to learn and follow along with lessons
  • A computer or mobile device with a modern internet connection

Description

Understanding React is a React open source library course published by Don’t Imitate Understand Online Academy. React is a popular JavaScript library for building user interfaces, especially single-page applications where data changes over time. Developed and maintained by Facebook, React allows developers to build large web applications that can efficiently update and render in response to data changes. It is known for its simplicity, flexibility and performance. Its component-based architecture and extensive ecosystem make it the preferred choice for developing modern web applications and beyond.Designed for both React beginners and experienced React developers, this course will dive deep into React’s internals: the React source code itself, giving you a deep understanding of how React works. In this course, you will fully understand how React works, allowing you to use and debug React well. In this course, you will learn about topics such as the React element tree, fiber tree, JSX, Rendering, Reconciliation, State, Hooks, Effects, Suspense, React Server Components, etc. After completing this course, you will be able to use all the potential of React.

Instructor

S

Senior Industry Specialist

Specialist in Web & Full-Stack Development

Passionate educator focused on real-world practical skills, modern frameworks, and production-ready engineering practices. Delivering step-by-step masterclasses accessible to learners globally on MJ Accedemy.

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