How to properly maintain the engine in an Audi A4?

I just bought an Audi A4 and I want to make sure I keep the engine in top condition. What are some key things I should be doing to maintain the engine properly?

Regularly change the oil and oil filter according to the manufacturer's recommended schedule. This will help keep the engine running smoothly and prevent any potential damage.

Keep an eye on the coolant and top it up if needed. Low coolant levels can cause engine overheating, which can lead to costly repairs.

Check the air filter and replace it if it's dirty or clogged. This will ensure proper air flow to the engine and improve fuel efficiency.