Advice on the purchase of used cars

Hello, I need a little help in buying used cars, have relatively little idea and with as many car types and models as they are also lost the overview. I myself have had the driver’s license for almost 1.5 years, and would like to buy my own car, which should be insured first by my parents as a second car. In general, it is important for me that the car is robust, so I don’t have to go to the workshop every 2 weeks… The car should cost up to 2000€ and be near me (Bonn). The car should be used mainly for driving to the civil service station (about 25 km a day) and for the private. I guess about 10,000 – 20,000 km a year… So far I have mainly looked after a Mercedes 190 (was recommended by some people), otherwise I still noticed Audi 80, where I have no idea what it looks like with the “useable car” … But I am actually open for all car types that would be well suited Thanks already for all the answers