My car started this morning and when I got home I got back in the car it don't start

What is your question?

I went to the store this morning and my car started no problem and an hour later I got in the car and it wouldn't start I checked the battery and it was good I changed my starter I had them check my starter and it was bad so I bought a new starter and I changed it and it still won't start

What makes this problem better or worse?

The same

How long has your 1999 Chevrolet Monte Carlo had this problem?

Just started