How to Fix a BMW Engine that Won't Start?

I recently purchased a used BMW and it has been working great. However, today it wouldn't start and I have no idea why. Any advice on how to fix it?

First, check the battery and make sure it is fully charged. If it is not, try jumping the car with another vehicle or a jump starter.

If the battery is not the issue, it could be a problem with the starter or the ignition switch. You may need to take it to a mechanic for further diagnostic.

Make sure all the wires and connections are secure. Sometimes a loose connection can prevent the engine from starting.