I am trying to become a better online MTT player. Mostly deep field 300+ man MTT's

Does anyone have a course they recommend that substantially helped their game in this regard?

Thank you,

One of my friends is a very tight player, he played at low limits.
Once in an expensive tournament, he got to the final table, took 4th place and won a lot of money. After that, he began to play more loosely, more aggressively. Then he compared his statistics, and he started to get into the money less.
There are players who win by playing aggressively, and there are players who win by playing tight.

I recommend videos of players like Patrick Leonard or you can even watch the broadcasts on twitch. But if you prefer the courses it seems to me that the best in this is Zeros

I don't know my friend but I can tell if I join. I have 30 to 40% chance of winning. Bad beats and the flip are your enemies.