Battery issue

I had to change my light bulb yesterday and had to take the battery out to change it. After I did that,I put the negative and positive on and it started up fine. When I tightened the bolts it wouldn't start at all. There's a new starter in my car a new engine. I got a new battery this morning and still won't start COULD someone PLEASE PLEASE help I can afford a new car.

Since you played with the car check all fuses for starters.

Visually inspect the engine bay. You may have knocked something out, disconnected something.

Good luck,
Sam