I need a good book on game design 101.

Also make sure to take a look at those links (unfortunately not a book ^^):
https://docs.unrealengine/latest/INT
https://wiki.unrealengine/Main_Page
https://wiki.unrealengine/Videos

Here you can find really good videos about game design in general: https://www.youtube/user/ExtraCreditz (highly recommended) :slight_smile: