Rowena told us about the three kinds of witches:
1) Naturals (like her… and I’m wondering if Spike and Cordy from that S7 episode were, too, since they were just as effortlessly about it as she was, and yet didn’t act beholden to anyone iirc.)
2) Borrowers (the demon-worshipping kind, like Ruby was in her original life — this is the category that most of the witches we’ve met appear to fall into)
3) Learners (who are not as strong as Naturals)
We had Sam telling Charlie to instruct him on hacking and “then I’ll be the bad one”. Charlie is the natural hacker, but she can teach Sam how to do it so that he can help save the day.
We also found out just this episode that witchcraft, used properly, can definitely remove the Mark.