Join Date: Jun 2019
Posts: 63
If you are brand new (or newish) to MTT's, the Harrington books are worth the investment. They may be fairly dated now, but they are definitely a great starting point to get to grips with positional play, opening hands etc
I'm not great with the in-depth math, but when I made the transition from cash to MTT's in 2011 I found those books very useful. Never taken an online course so other may be able to help you there.
Micro MTT's you should still do very well with a solid ABC game and TAG style of play.