Cuda acting up. Turn key and nothing?

so if I use a screwdriver and jump the starter realy with the ignition turned on the car should crank the starter correct? That means starter relay probably bad..

No, read my post more carefully.

One scenario is if the main big terminal or cable from the battery to the big starter stud is bad, the starter solenoid won't even pull in

IF you follow my post step by step, it should lead you to the problem.

The big "problem" (pun intended) with these "problems" is that an intermittent problem can hide the true nature of things