react.dev/content/docs/faq-structure.md

id, title, permalink, layout, category

id	title	permalink	layout	category
faq-structure	File Structure	docs/faq-structure.html	docs	FAQ

Is there a recommended way to structure React projects?

One common way to structure projects is locate CSS, JSX, and tests together inside folders grouped by feature or route.

FeatureA
  index.jsx
  ComponentA.jsx
  ComponentA.scss
  ComponentA.test.js
  Helper.jsx
  Helper.test.js
FeatureB
  index.jsx
  ComponentB.jsx
  ComponentB.test.jsx