What are the common oil leaks that can occur in an Audi A4?

I've noticed some oil spots under my Audi A4, what are the possible causes and how should I address them?

One common oil leak in the Audi A4 is from the valve cover gasket, which can start to fail due to age and heat exposure. Another possibility is a leak from the oil pan gasket or a damaged oil drain plug. It's important to have these potential issues checked and repaired as soon as possible to prevent further damage to your engine.