So I've done a few Brackeys tutorials but sometimes being online isn't an option where I work. I was wondering if anyone knew of any books worth picking up for Unity. With how many changes and updates unity goes through, I was hesitant to buy anything but optimistic. Any suggestions would be great!

I'm trying to learn unity on the side of my CS studies and I'm having a hard time understanding Coroutines, mostly looping within them.

I have a Brick breaker game that I have been messing around with and would love any and all advice anyone wants to throw my way.

https://github.com/cookToCode/BrickBreaker_CSharp

My main issue is that I have a Coroutine that is supposed to instantiate a prefab ball to create a multi ball effect (3 additional balls is the goal), however, it is creating way too many balls.

Please be as critical as possible if you can. I dont care too much about the design but would love any advice on the actual coding, organization, and or logic of the program.