It helps to know that the basic tutorials still apply. You don't need these advanced features. Certainly not for basic projects, and possibly not ever. After all, people successfully wrote React apps without it.

One mark of a framework with a future is that it supports its past. A framework with a lot of breaking changes is one that is not mature, and may never be mature.

Even with the substantial shift in React from classes to functions and hooks, old code still works. You probably don't want to start writing class-based React, so you want a tutorial written in the last 5 years, but those are hardly new and certainly not specific to React 19.