How to troubleshoot a no-start issue in an Audi 80?

I have an Audi 80 that won't start when I turn the key. The battery is good and all the lights turn on, but the engine doesn't even crank. What could be the problem and how can I fix it?

First, check the fuel level and make sure there's enough gasoline. If that's not the issue, then it could be a problem with the ignition system. Check the spark plugs, ignition coil, and spark plug wires for any damage or wear. If everything looks good, then the issue could be with the fuel pump or fuel filter.

If the engine still won't start, it's possible that there's an issue with the starter motor. Check the connections to make sure they're secure and not corroded. If necessary, you can try jump-starting the car to see if that gets the engine running.