well, Big, I don't think I'm one to answer, the when is enough, enough, thing, lol...but the stuff you mentioned, in my opinion, just what a newbie needs, especially that knot tieing stuff.
Well, the other stuff is just as important, but seems more readily available info. Great for a class.
How to get things "squared", accurate 1/4" seams on machine,...all the info on how to get accuracy is what newbie's need.
How to keep rulers from slipping. It took me a while to get up the courage to cut my fabrics with rotary, bc I was afraid I would ruin it, with slippage. I put sandpaper on my rulers. I had bought this clear stuff, and it didn't do it, for me.