Well, I'm no expert but here is some stuff that might help
.
Softer Front Suspension: Less responsive handling but the car should turn into the corners better
Stiffer Rear Suspension: When you hit the throttle coming out of corners, the back end will likely step out
Softer Front Anti-Roll Bar: Better bite into corners
Stiffer Rear Anti-Roll Bar: Will most likely make the car skid more just as you're leaving the apex of a corner
More Front Wing: Better turn in but too much can result in a lot of sliding on turn in. (Medium-High Speed corners)
Less Rear Wing: Will help make the car a bit looser at the back between mid-exit of a corner (Medium-High Speed)
Hmm... well, thats my knowledge of what those things do. If you do the opposite of all of that, you will get the opposite result which is understeer. Tbh, I get confused sometimes and sometimes, can't detect a difference when I change something in the setup (Front ARB for example, decrease by 40 Nm. but I wouldn't feel much difference). I'm still learning car setup and by no means, an "expert" but I'm learning new things about setup and my driving style too
.
Also, remember, different settings can have come into play at different speeds. For example, in high speed cornering, downforce is a large factor of how the car will handle. Suspension and the Anti-Roll Bars generally affect the car all the time but have a more significant effect in slow corners. Its all very complicated and you can never get the perfect setup where it works well in every corner, its all about compromise