Just watched your vid on GetNPUsers.py and kerb pre auth, very good!
A video on AD would me really helpful for me personally but for the whole htb community I think since as you said, a lot of people state that AD / Windows is their weakness.
What I would personally like to see in this video is:
What is LDAP and how it works
What is RPC and how it works
What is SMB and how it works
more kerberos stuff
Active directory objects etc
forests (?)
maybe you could also state what the best practice is for AD in general, what to look out for and maybe even how to look out for attacks.
In any case thanks for making your videos, pretty nice 