It's not a book, but I think the most high quality introduction to Godot is by HeartBeast on youtube. I went through his "Pixel Platformer" video "Godot action RPG" playlist. These were quick and got me everything I needed to get started.
Here are some games I made as a hobbyist with godot, in increasing complexity:
I've bought both of his courses and can confirm they are excellent and absolutely worth the money (although I got his newest one at a deep discount, it's fairly pricey). He also makes himself available for questions over Discord and very friendly.
Vampire Survivor like games are top-down action games where you move your character and it auto-attacks hordes of enemies. You gather XP and choose from a few options each level up. You end up selecting s handful of offensive and utility capabilities and get ultimate versions of them if you manage to max them out. There are some synergies between the different weapons and items you end up choosing in your build (complexity of synergies varies in the genre.) If you’re familiar with autochess, the leveling/building takes cues from that genre.
[0] https://www.youtube.com/playlist?list=PL9FzW-m48fn2SlrW0KoLT...