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
If you like the RaspberryTips website and need a step-by-step help to improve your skills on Raspberry Pi, you'll like this book
Learn useful Linux skills and practice multiples project with step-by-step guides
Make one little step a day to be an expert in 30 days.
Available in Kindle or Paperback formats
Raspberry Pi Cookbook
This one is probably THE book for any Raspberry Pi owner.
It's a bible with over 500 pages
Pi Projects for Genius
If you want to discover Raspberry Pi through projects,
this one is for you.
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
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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