what 3 things do you worry about most in photography

the three things i worry about most in photography is foucs expostion and the picture i worry about focous because if your not foucused you want be in the right state of mind to take a picture because when your not foucosed you got so much other stuff running through your mind and its harder to think when yur trying to foucus and your thinking about like 10 million other things it just want work