Hi! I'm fairly new to illustrator, and I was wondering if anyone here would know how I could achieve this text modification where a letter is folded into itself and by doing so creating that negative space? I'm having quite a difficult time trying to figure out how to do this, couldn't find any tutorials on this, any help would be amazing!
That is something you cannot derive from the letter shapes by using Illustrator functionality.
You would use the original letter shape as a template and then first sketch it, refine it and then draw it. In order to get these equal width negaive shapes, you would use functionality such as outline stroke or Offset path, but other than that it is manual work first, then vectorization.