I think that teaching classes would be interesting. I have a lot of industry experience, but I never actually got a degree in the field I work in, and I don’t have any sort of degree that deals with teaching. Is it possible to get a job as a teacher without those?
Edit: I’m in the US specifically looking at teaching college courses, but K-12 could be interesting, too.
I hope your want is for something other than English.
Yes. In the US, there are credential programs depending on what state you live in. At least for K-12.