What? Car won't start? Could be a million things. You have to tell us more. What does it do when you turn the car over? Will it turn over? Clicking noise?
Could be
1. Alarm system went off - Unhook your battery, and hook it back up
2. Starter, tap it with a wrench or get it tested at advance auto
3. Grounds dirty, clean them. Are the grounds on the intake manifold hooked up?
4. Fuse
5. Starter wires loose or not hooked up
If it's not cranking it could only be a few things. More than likely it's the starter.
If it's turning over just not running, could be
1. Spark plugs
2. Plug wires
3. Coil pack
4. Fuel pump
5. TPS
6. MAF
7. Vacuum leak
8. Fuel pressure leak
9 so on and so fourth
Catch my drift? Does it run, just not idle? Help me out and I'll help you out too.