How to troubleshoot an issue with the Audi A3 engine not starting?

My Audi A3 won't start, but all the lights and electronics seem to be working fine. What could be the problem and how can I fix it?

First, check the battery to make sure it's charged and the connections are secure. If that's not the issue, it could be a problem with the starter or ignition system. It's best to take it to a mechanic for a diagnosis and repair if needed.

Another possible cause could be a faulty fuel pump or fuel filter. If those are in good working condition, it could be an issue with the spark plugs or wires. Again, it's best to take it to a professional for proper diagnosis and repair.