General Maintenance & Repairs - Concern? Wouldn't Start

So I drive the car today to the gym and then to get gas, pull up at the pump and ill it up with 93. Get in car, go to start it, and it just makes a 'Click' noise, it will not turn over. I try a few times and cannot get it to turn over. I figure what the hell and try and jump start it (in a real tight space, by myself) to no avail. So I push it into a parking spot and try one more time....starts fine. I drive home, no SES lights, everything looks great (volts, oil pressure). I park it and start it again, no problems.

Would you be concerned? Anything I can check? Could it be a dead spot?

Car always starts fine, everyday. I am thinking when I tried to bump start it, probably just moved the flywheel a little bit and now it starts fine.

Battery terminals or starter

Bad battery connection, tighting down your terminals insure its a good connection. The reason the starter makes that noise because of lack of power to turn the motor over.

starter solenoid possibly.

Battery terms were tight, just went and started the car immediately after driving it, an hour later, then 6 hours later...starts fine.

I have a general understanding of what the problems could be, but should I be concerned about this at all?