Why is my Vauxhall Insignia not starting?

I have a Vauxhall Insignia and it won't start. I have checked the battery and it seems fine. What else could be causing this issue?

First, check the fuel pump and fuel filter. If those are working properly, it could be a problem with the ignition system.

It could also be an issue with the starter motor or the spark plugs. Have those checked as well.

If all of those components are functioning properly, it could be a problem with the engine itself. Have it checked by a mechanic.