How do I troubleshoot my Audi 80's engine failure?

My Audi 80's engine suddenly stopped working while I was driving. There was no warning sign and it won't start again. What could be the cause and how can I fix it?

First, check if there's any fuel in the tank. If there is, then the issue might be with the spark plugs. Try replacing them and see if the engine starts.

It could also be a problem with the ignition system. Check the ignition coil and see if it needs to be replaced.

Consider checking the engine's timing as well. If the timing is off, it could cause the engine to fail.