What are the common issues with the clutch on an Audi 80?

I've been experiencing some issues with my Audi 80's clutch and wondering what are the most common problems that could cause this. Any tips on how to diagnose and fix them?

The clutch pedal becomes stiff and difficult to depress or engage. This could be due to a worn release bearing or clutch disc. Check for any signs of damage or wear and consider replacing these components.

Burning smell when using the clutch or slipping gears. This could indicate a worn clutch plate or pressure plate. Have a mechanic check for any damage and replace these components if needed.