I always shout out "Automate the boring stuff" because it is excellent and free: https://automatetheboringstuff.com/3e/chapter1.html
I find picking simple tasks that I want to accomplish can be a great way to learn things, and the book above is a fantastic resource for this. If you want to learn how to modify values in a CSV file or perform calculations or get data from the internet, this teaches you how. When you need to understand a function, go read the documentation for how it works but dont get bogged down. Small iterative cycles with a feedback loop are how we learn. Read how to do something, extend the idea and apply it yourself, see what works and what doesn't. It becomes fun after a while.