How do I troubleshoot non-functional turn signals in my Audi 80?

I've noticed that the turn signals on my Audi 80 have suddenly stopped working. What steps should I take to diagnose and fix the issue?

Check the fuse for the turn signals. If it is blown, replace it and test the turn signals again.

Inspect the turn signal bulbs. If they are burnt out, replace them with new ones.

Make sure the turn signal relay is functioning properly. Consider replacing it if necessary.