Good source code to read and learn sdl2?

Hello!
I’ve been following the trusty lazyfoo’s sdl2 series. But I’m more of a learner by looking at code…
Do you guys recommend something? Not too complex that it adds to the overall complexity of learning the tool, but not too simple like “oh, gameloop, show texture”.

Let me also take the opportunity to ask, how was your learning experience? What did you use?

Best regards.