Hello KNEIVEL77,
The most common thing is SIFU; Self Induced **** Upp...
Putting yourself where you don't have control of the situation. Can be weather, technical, fuel, lack of skills or whatever..
You have to know your machine, your skills and the enviroiment you are flying in to minimize the risks..
It is all process, starting with the first flight and continues through your career. And it's great fun all the time, if you do it open minded and honestly.. It's just like some games; A minute to learn, a lifetime to master !
Fly safe !