I don't have a book idea, but experimenting with circuit layout and programming in TinkerCad has helped me a bit. It's got a rudimentary stimulator too. I found

I don't have a book idea, but experimenting with circuit layout and programming in TinkerCad has helped me a bit. It's got a rudimentary stimulator too. I found exporting the code and inspecting it to be useful to understanding how to program an ATTINY85.