What's something you learned recently that's helped your game?

Post your nugget of info and hopefully we can all learn something new!

This is somewhat recent but I want to mention this for other players like myself who wasn't aware. You can surprise attack using a 90 degrees wall bend and a reach weapon. Specifically, leading a mob around the bend and attacking once you see it again. You do need to hug the walls on the last two tiles of the bend and then you're free to keep hugging or move diagonally. Obviously, this isn't meant for square rooms and similar right angled walls but ones where you can escape line of sight to make the surprise attack.