Is their any Youtube walkthroughs where people go through and explain Function programming on FCC?
Is it on the FCC Youtube channel by any chance? That guy does a great job at explaining things and I wonder if he made any video on it either (or anyone else).
Update:
Fun Fun Function did a great series on this:
I’ve been watching this video and it’s been fairly helpful. It’s an archived live-stream, so it’s not exactly the same as some of their other “lesson” videos, but it was helpful all the same.
Fun Fun Function did a great series on this:
I just understood that it goes above my head. 
Takes notes. I write it out as if I am teaching it (Google Docs) and that helps me to remember.