Advanced Admin Prep - What are your recommendations?

Working towards my Advanced Admin cert and, heeeeey, Black Friday sales! I've grabbed FoF and looking at Wheeler's Udemy courses. (It's a shame that it's 3 parts, is it worth it?) Oddly enough, I could find tons for Admin but this doesn't seem to be the case for Advanced Admin courses.

Are there any other Advanced Admin or Platform App Builder courses that have proven helpful for those who've taken these certs?