Let's face it not many of us know or use all of the menus and functions that are on our camera, but it is useful to know some of the basic ones.
EV +/- This is used to dial in exposure compensation. For example when photographing white objects like snow they often come out grey instead of white, because the camera circuits expect an average grey scenr and so white is underexposed to grey. Dial in a + value to compensate. Likewise, dial in a -ve value for overexposed subjects.
ISO This is used when light levels are low and you can't get a fast enough shutter speed to capture your subject. Increase the ISO to allow you to use a faster shutter speed where you can't use flash, e.g. in an aquarium.
WB The White Balance adjustment is usually with the Shooting Menu and allows you to shoot indoors using normal domestic (tungsten) bulbs without getting a yellow cast to the photo. Simply adjust the WB to the dominant light source.
There are many others of course but if you know these you will get better shots in difficult lighting conditions. It is a bit like knowing what the wiper switch or headlamp switch does when driving a car. You don't need them on a dry day but you will need them in rain or fog.