The two single largest causes of accidents listed in the Nall report are "Loss of Control" during landing, and "Loss of Control" during takeoff.
The Nall report is always interesting, but not super clear. Sometimes I prefer to just look at the NTSB reports. Here what I get out of it, looking mainly out of fatalities for GA fixed wing:
1. For general categories, takeoff accidents lead with 23 fatalities out of 111 accidents while weather is a close second with 21 of 23. Landing is 1 out of 322. Takeoff is more dangerous than landing. A bad decision with respect to weather is a good way to die.
2. Looking at the details of the categories, Stall/spin/loss of control is about 39% of fatalities. 14% weather, 7% hitting something, 7% fuel management, and 33% miscellaneous. So, use good technique base-to-final, be careful when the weather gets iffy, don't be an idiot showing off, use good fuel practices (cause running out is embarrassing), mind the details cause one of those might get you (like high density altitude).