Rendering Elements
Unlike browser DOM elements, React elements are plain objects, and are cheap to create.
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Components and Props
They accept arbitrary inputs and return React elements describing what should appear on the screen.
Forwarding Refs
This is typically not necessary for most components in the application.
Conditional Rendering
You can use variables to store elements. This can help you conditionally render a part of the component while the rest of the output doesn’t change.
Lifting State Up
Every update goes through the same steps so the inputs stay in sync.
Composition vs Inheritance
Sometimes we think about components as being “special cases” of other components.
Introducing JSX
It is called JSX, and it is a syntax extension to JavaScript.
Code-Splitting
Bundling is great, but as your app grows, your bundle will grow too.