If you need more detailed information on a topic, books are a great option
I already wrote an article about the best books about Raspberry Pi
And you can see here the best one by category
Raspberry Pi Cookbook
This one is probably THE book for any Raspberry Pi owner.
It's a bible with over 500 pages
Python Crash course
If you're interested in coding, it's probably the one you need.
A big part is kept for practice, that's why it's a crash course
Pi Projects for Genius
If you want to discover Raspberry Pi through projects,
this one is for you.
Zombie Apocalypse
My favorite in this part.
The Maker’s Guide to the Zombie Apocalypse is so original.
I let you read the Amazon description to find out more!

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I recommend these products because I use them myself and I know them.
This is simply a list of what I use and love