Best lowstakes online MTT Course/Study Material?

Bad live cashgame reg from 2013-2017, lifetime winnings of USD250k+-

Leaving my fulltime job soon to take a break for 3-4 months while travelling, figured I can play GGPOKER.

Played a little on GGPOKER and losing overall on low stakes.

Looking for some materials to brush up on tournament basics.

Options seems like Upswing and Raise Your Edge.

Just wondering if anyone else have any feedback/input for the above mentioned content OR any other better study material.