What is the best way to troubleshoot an issue with the Audi 80 ignition system?

I am having trouble starting my Audi 80 car and suspect it may be a problem with the ignition system. What steps should I take to diagnose and fix this issue?

First, check the condition of the ignition coil and spark plugs. If they appear worn or damaged, they may need to be replaced.

If the spark plugs and ignition coil are in good condition, the issue may be with the ignition switch. You can test this by checking for power at the ignition switch with a voltmeter.