anything that flies has the ability to crash,thats an obvious statement you will be thinking,whats not so obvious,is that if you have a good understanding,of these following things then you will decrease the chances of that day happening
(1)read the manual and fully understand what your drone and controller do in relation to each other
(2) learn how the app works and what information it is giving you during flight and how to change settings on the screen
(3)be aware of your surroundings when you go out to fly is it an appropriate place to fly in
(4) is the weather suitable to fly ie,is it too windy,is it likely to rain during your flight
(5)are all your batteries fully charged ,including controller and screen devices
(6)have you checked the condition of your drone is it airworthy,as the PIC it is you who has to make sure you have done everything possible to have a safe flight,
of course no matter how thorough you are, there is always that unforeseen problem not under your control that could bring your drone crashing down from the sky,but that is true of anything we do