What needs to be maintained regularly?

I have a Clio 3, bj 2007. He has already run quite a lot, to the 60,000. What do I have to change regularly, fill up etc, so that he stays in top shot? So far I pour from time to time oil, once it has been completely changed and refueled I can well *laugh* Then also immediately the next question: Which oil should I tip in best? I now have such a cheap product, 5 W 40 . I hope on many Antowrten and the he r me again as great as last time help 😉 Would be nice if you answered quite extensively, so that the poor car really doesn’t collapse under me, because I forget something 😉