Best advice I can give is start the tournament with a tight opening chart. Understand why UTG only opens TT+, AK, AQs, while CO raises 55+, QJo+, 78s+.
Next learn a small stack strategy, like when you are under 10BB. You shove good hands, call almost nothing, and fold everything else.
Biggest mistake I see players make is when they get a few chips, they play more hands. They think being table chip leader means they can start bullying people or play that QJo from UTG. Once you chip up, save those chips to invest in good hands.