you'll soon learn that what ever you dont look at is what a problem will arise from.
what you want to look at is everthing, not OVER LOOK everything!
every bolt that you can find should be checked visualy for looseness and if its chaffing (a brown or grey powder coming out of it). all moving parts that can be moved, move them looking for smoothness, looseness and fowling. anymore than a tiny bit of play in somthing needs an expert opinion.
if your not happy with your preflight, dont go flying. ask the instructor to go through a section with you, (i remember the whole lot seemed too much to take in) and remember, your paying the money.