Some of these definitely require more explanation. Like, how do you even eat with them if you can't put the tips into your mouth? Just toss the food upwards and catch it?

I live in Japan and see most of those every day. Passing things between chopsticks (and, as I found out the hard way, by extension two sets of chopsticks used on the same dish), and stabbing them vertically into something are the two to care about.

Can we just get a shorter list of what it's OK to do?

I know a couple are explicitly tagged as serious, but those aside, how many are real faux pas, and are there some that are generally ignored in more casual settings?

Holy hell there are way too many of these

TIL, I have terrible manners, and I should probably work on that.

This is really informative, thank you for posting. Besides the serious ones and a few obvious ones (at least for people living in Japan, like 刺し箸 or the other 指し箸), I have been guilty of a few of these (looking at you こすり箸 and 橋箸).