What should I do if my Audi A3's engine won't start?

I have an Audi A3 and the engine won't start. The battery seems to be fine and all the lights are working. What could be causing this issue and what are some steps I can take to troubleshoot it?

First, make sure your car is in park and that the key is in the ignition. If those are all set, check your fuel level and make sure it's not low. If the fuel level is fine, try jump-starting your car with another vehicle. If none of these solutions work, it could be an issue with your starter or ignition. It's best to take your car to a mechanic for further diagnosis and repairs.