Stupid Groom Checklist?

Okay this is probably going to cause some humor, but as a first time Groom I think I need of list of things not to do. Here's why I'm posting:

There's a Tiktok going around of a couple doing a cake cutting where the groom eats the piece of cake off his own fork.. The bride appears frustrated but frankly I was *oblivious* at the fact the bride & groom were supposed to feed each other. (I would have absolutely done the same thing had I not seen this!) I know it's a lot to ask, but anything you can think of would be helpful to a groom that has spent every wedding he's been at next to the bar and not paying attention.

TLDR: Please help a groom to not make a complete ass of himself on his wedding day.