My biggest “hole” in my training (that I know of) is my knowledge of bits.  You explain pretty good about the snaffle bits.  I don’t have a couple grand to go out and buy a bunch of tom balding bits.  With that said what bits would you say are “must haves” and what do you stay away from?  The only snaffle I have is an old O ring that’s super heavy like literally probably 3lbs.  I worry it’s too much for most young horses.  I got it to soften up an old stiff rope horse years ago.