Understanding React

From the creator of "JavaScript: Understanding the Weird Parts"

Even if you've been using React for years, your mental model is likely inaccurate. That's because the best mental model is understanding how something really works.

React is wildly popular and well-established in the job market for web developers. However, to use and debug it well, you must understand how it actually works.

In this course, designed for both React beginners and experienced React devs you will come to deeply understand how React works under-the-hood by diving into React internals: the React source code itself.

What Students Are Saying

"I highly recommend this course! Even for devs who have worked in React for years. Tony’s way of digging through the source code under the hood has completely changed my mental model. Incredibly valuable." - Heather M.

"Magnificient!" - Miroslav M.

"This is the best React course I have taken and I have taken a few to be honest. You have overdelivered on this Tony" - Eyitayo O.

"Remarkable course." - Nilkamal S.

"Thank you Tony, for spending the time to approach React from a deeper perspective." - Nicolas G.

"I have clear picture now how React is working under the hood. And also the last project was fun." - Matija R.

"As a self-taught developer who transitioned from education to tech, his teaching style resonates with my teacher training – exploring the “why” instead of just the “how”, gradual build up of concepts, simple explanation of technical jargons, etc. The feeling of true understanding is a deep satisfaction that hacky tricks will not achieve." - Shelly C.

Most courses teach you how to use React. In this course you will fully understand how React works, which will enable you to use and debug React well.

You will gain truly under-the-hood knowledge on topics such as the React Element Tree, the Fiber Tree, JSX, Rendering, Reconciliation, State, Hooks, Effects, Suspense, React Server Components, and more.

That knowledge will give you a clarity that will serve you well every day you use React, or React-based frameworks like Next.js or Remix.

Hi, I'm Tony Alicea, a 25-year veteran in web and software development. I'm a bestselling Udemy instructor and Pluralsight author. You can find me speaking on podcasts like JavaScript Jabber and at conferences like React Summit.

My goal in creating this course, just like in my other courses that have been taken by 345,000 students, is to take you deeper than anyone else into truly understanding React.

You Get Lifetime Access To...

16.5 hours of video.
158 lectures.
80 sample code folders.
Certificate of completion.
Questions answered by me personally.
All future updates free.

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Team Discounts

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Course Curriculum

When you enroll you gain access to all videos, source code, and questions directly answered by me!

Start Watching Below for Free!

  Introduction
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  The DOM and Declarative Programming
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  React Elements
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  JSX
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  Fiber and Reconciliation
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  Execution Contexts and Pausing Work
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  React DOM and Rendering
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  Events
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  State
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  Hooks, State, and Reducers
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  Adding Your Own Side Effects: useEffect
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  useRef and forwardRef
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  Custom Hooks
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  Component Design
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  useContext
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  useId and Key
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  memo, useMemo, and useCallback
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  useContext and Reducer
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  Toolchains
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  Strict Mode
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  Forms
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  React Dev Tools
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  CSS and Components
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  Class Project
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  Meta-Frameworks
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  Suspense
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  React Server Components
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  Conclusion
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Look forward to seeing you in the course!

- Tony