When my blog and books are not enough, and you want to master a topic faster and deeper, you can take a course
There are a lot of courses out there, but here is my selection on Udemy
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Beginner course
A-Z guide to understand the features of your Pi.
Learn basics and build your first hardware project
Check the course details
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Retro Gaming Machine
Learn how to build you own retro gaming machine.
Lakka, Recalbox and Retropie are at the program
Check the course details
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Python Masterclass
Python is the main programming language on Pi.
You'll learn in this course everything you need about it
Check the course details
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Hacking with Pi
Learn ethical hacking with your Raspberry Pi.
Use it for penetration testing and security auditing
Check the course details

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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