Basics of bloodhound
I had not previously heard of BloodHound, but I aim to give it a serious try after reading this great writeup by the defense dude. Bloodhound maps your Active Directory and shines a light on the riskiest things.
Why I like it: This is an article aiming to help you get started using a tool effectively. And the impact of this tool is fantastic. Run it and you will know your network, by which I mean see it though the eyes of your attacker.
Bonus: read what the creator of BloodHound has to say here.