Top 10 Edition tips

Make a PC feature cheatsheet.

I can't believe I never made this before, it's so helpful: http://imgur.com/a/DeRsNIt's just a little one-page reminder for me to reference to keep handy the player's actions and some key info on them.I'm not putting every race/class feature from the part on it, just the key ones that are actions, bonus actions, or reactions, or have specific usage limits (on your turn, once per turn, etc.), plus a few other ones that have specifics worth remembering, like Sculpt Spells' requirement to see the creature excluded. I find my biggest shortfall in the blur of combat is trying to remember if the player is trying to take a bonus action when they've already used one, or using some other ability when they shouldn't be able to.