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Also, I'm happy to chat about how to handle the migration! I've been doing a lot of that work myself over in https://github.com/replayio/devtools - you can see a lot of the PRs I've merged have been about migrating React+Redux to RTK and TS. Best place to chat would be the #redux channel over in the Reactiflux Discord ( https://www.reactiflux.com ).
We normally recommend that people should start with the "Redux Essentials" tutorial, which shows how to use Redux Toolkit as the standard approach. There's also the "Redux Fundamentals" tutorial, which teaches how it all works from the bottom up. But, both of them explain what useSelector is and how to use it.
If you've only been looking at https://redux-toolkit.js.org , yeah, that doesn't talk about useSelector at all, for a couple reasons. RTK itself doesn't have anything to do with React, except for RTKQ hooks. And, all the actual "tutorials" are in the main Redux docs site , at https://redux.js.org/tutorials/index . That's where we teach you about useSelector.
Redux core library, and general Redux tutorials and usage: https://redux.js.org
React-Redux API reference and usage: https://react-redux.js.org
Ah, yeah, don't use the main existing React docs at https://reactjs.org. Those are definitely outdated at this point.