A few of the companies I applied to have specifically asked for multithreading and concurreny as skills which will be tested in interview rounds. (Rubrik and Instabase).

I am currently trying to prepare for multithreading and concurreny (in C++) and have solved the leetcode "concurrent section".
I would like to prepare for concurrent programming questions.

Are there any courses, links, forum where people have discussed what to expect in interviews?
I am not even sure what the questions will be like. Thanks!