I’m 8-9k and still just look things up in OGS dictionary right here. I think you can lean some simple joseki from here, 6 moves or so long, and then study after your games to see what comes up. better to spend time on other things than joseki as a beginner
tbh, although the game is about controlling territory, I don’t know of good beginner resources focusing on this. it sounds like a more advanced topic, but maybe you want to learn about building territorial frameworks, some times we call that a moyo (模様) so try googling for it
instead, I’d look for things talking about groups, and thinking about groups being weak or strong. so basic life and death, like puzzles: Play Go at online-go.com! | OGS
I think another good book aside from Janice Kim, is Richard Bozulich’s The Second Book of Go. it gives you a little of everything in a small package, but quality stuff
for non-book resources, I have recommended Clossius’s beginner lecture series to many friends. it’s what got me over the hurdle of playing 19x19, and I think he covers a lot of ground in a digestible way for a beginner who has only played small boards a little
remember, play lots of games too, not just reading. it can be scary but you’ll have more fun. good luck!
For Discord servers, I recommend BenKyo’s, Clossius’ and the Open Study Room. Perhaps BeginnerGo as well. There’s a document called the Discord Discovery Guide which lists more (I don’t have it, I think it was made by Gooplet).
As goes forums, you’ve already found this one. There’s also Life in 19x19 and at least two subreddits (r/baduk and r/proweiqi).
For paid teaching, the only person I recommend to begin with is BenKyo, whose cheapest rate is at $15 / 45m + perks. (Disclaimer: I mod for Ben.) Check out the prices of other teachers and schools for comparison.
The list of "other resources " that you can access with the OGS menu is surely another good place to consider (including more choices for a teacher as @bugcat suggestion).
A word on the AI revolution
Because of what AI brought to us (around 2017), mostly new perpectives on the beginning of a game, you need to have some distance with anything on fuseki (opening patterns and theory) and joseki published before AI and that is a lot of resources!
This includes for example the “in the beginning” book of Ishigure you mentioned in the OP (Sadly as i loved that book)