Engine will not crank, but battery & connections are good.................Try hitting the starter a few times. It may be stuck, or going bad.
Engine cranks, but will not start......................Most modern cars have an electric fuel pump in the fuel tank. When turning on the key, you should hear the pump come on momentarily. If not, check the owner's manual for a fuse or "shut-off" switch. If those are ok, you can try whacking the fuel tank on the bottom with a piece of wood or non-sparking item. Sometimes that will make it work to get you home at least.
Key will not turn in ignition..................Sometimes when you shut off your vehicle with the wheel turned, the steering wheel will lock into position making it hard to turn the key. Pull the steering wheel one way or the other to release the lock.
