This post by the Blog of Holding is from 2018 but I just discovered it today.
D&D 5E Monster Creation can be a little cumbersome at times. I’ve seen a lot of great advice out there but nothing as succinct as this, the “5e monster manual on a business card”. Paul Hughes does a great job of breaking down all the monsters in the monster manual mathematically and building quick and easy formula (so easy, it can fit on a business card). You could almost build monsters on the fly with this method. I am adding this to my DM Toolbox.