Offset
 

So right now I have stock wheels on my car and it says the offset is +48 and they tuck in the fender. Lets say if I get a wheel that is +43 and or +35 will it be out more past the fender because that's what I'm looking for a wheel that is not tucked in. So the higher the offset the wheel is going to be more into the fender right and lower numbers will be sticking out correct?

Thank you cause I am a little bit confused!

You've got it right. Those numbers are millimeters, so a wheel with 43 offset will stick out 5 mm ( 0.2 inches) more than the stock wheel with 48 offset.