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
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Raspberry Pi Cookbook
This one is probably THE book for any Raspberry Pi owner.
It's a bible with over 500 pages
Amazon.com
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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
Amazon.com
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Pi Projects for Genius
If you want to discover Raspberry Pi through projects,
this one is for you.
Amazon.com
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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!
Amazon.com

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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