https://superfastpython.com/python-asyncio/ - Python Asyncio: The Complete Guide

Effective Python has a great chapter that goes over concurrency and parallelism using threads, coroutines and subprocesses. There are a lot of non-trivial code examples that the author gradually shows how to improve with more advanced language features over the course of several chapters so it's not all thrown at you at once, enabling you see benefits and pitfalls of approaching problems with different techniques. I highly suggest it even beyond learning async features.

These might help:

* Async Python in real life - https://guicommits.com/async-python-in-real-life/

* Python Concurrency: The Tricky Bits - https://python.hamel.dev/concurrency/