Multiple Car problems

[KinaGrannis]

thanks guys for all the feedback but i have a more urgent question at hand

so my car used to die because of a grounding issue but after i resolved that, I realized that my car sometimes didn't start up. But it wasn't a battery problem because eventually I could turn the car on after a few turn of the key.
So I've searched some and come to the conclusion its either the starter or ignition switch or just the ignition cable
My question is how do i determine which one without having to buy all of them because i'm kind of on a college budget.
If i turn the key once, the lights come on but I kind of notice that I have to turn the key hard and the car will start
Advice will be much appreciated. thank you