How can I troubleshoot a faulty starter motor on my Audi A2?

My Audi A2 is having trouble starting, and I suspect it may be a problem with the starter motor. What steps can I take to troubleshoot and potentially fix this issue?

First, check the battery voltage to ensure it has enough power to start the car. Then, use a voltmeter to test the connection between the battery and the starter motor. If there is no voltage or a weak voltage, it is likely that the starter motor needs to be replaced.