9. No Closed Fists
It'll become more and more apparent over the course of this list that, while there are specific rules that wrestlers must follow when performing in a squared-circle, not everyone gets the memo and some can simply get away with not paying attention altogether.
That takes us nicely into the laws behind what exactly a wrestler is allowed to throw at their colleague when trading strikes in-between the ropes.
The art of absolutely nailing a punch in a pro-wrestling environment is one of the most under-appreciated known to the form, with it taking an immense amount of timing and selling to convince audiences a right hook has actually connected. In order to protect the person on the receiving end of this worked punch and not have audiences wonder why a wrestler hasn't been knocked out instantly, it's largely understood that there are to be "no closed fists" when firing off a straight, hook, uppercut, or any other hand.
However, as time has gone by, it appears this particular rule has relaxed somewhat, with Roman Reigns frequently firing off his closed-fist Superman Punch and Brock Lesnar even taking things up a notch by walloping Braun Strowman with a legit shot a few years back.