Unity or Unreal for making a 3D game?

Next make your virginity dissappear lmoa

Use Github

Nothing much got added, except for this.
gameenginebook.com/resources/ConcurrencyLecture.pptx
The book takes everything in that slide deck and goes over it again. You're not missing much.

The stuff that got added in the third edition is nice to have but not really essential. You'll be fine using 2e if you can't find the 3e.