It turns over but won't start
It won't start but will turn over
Even though the starter works, it might not be turning fast enough to start the engine, so it could be the battery. Are all the connections clean & tight. Might be a defective starter motor/solenoid, regulator, relay, neutral safety switch, or even the ignition switch..... Beyond that, your car might have an ignition or fuel pump problem. You're either not getting proper fuel or spark. Really could be either. Without seeing the car, it's not possible to say what the exact problem is. Why don't you take it to a mechanic to diagnose. You'll then have his opinion and estimate and can have him fix it, or use his review as a guide to doing repairs yourself?