Q: My 1996 Honda civic won't start

I drove to a Gas Station to use the ATM, car was fine. Walked out of the store and started my car, then drove it to a pump so I could clean my windshield. When I got back in the car it started right up no problem but immediately started sputtering and then died. I let it sit for a minute then proceeded to try and start it again but it wouldn't start. The engine will turn over just fine but will not fire. I've done as much research that I can online but haven't had any success and I am certainly not a mechanic. I bought a new main relay switch 2 days ago and installed it but it did not fix the problem so now I'm out of ideas. Any help or advice would be much appreciated. *just for reference - the night before this incident happened, I was trying to fix my low headlight issue by removing the ground wires and bolts under the hood, scraping the location with a wire brush and put it all back together. (didn't work either lol). Not sure if that effected the car not starting

My car has 240000 miles.
My car has an automatic transmission.