What small car?

Hello first of all to this forum I am now 20 years old and have been feeling for 2 years and 2 months. unfortunately I have to ask myself because I could not really find something for this purpose. I will be serving civil service from november and at the beginning of my (hopefully) training in the next year I will buy a car. the question arises: which? so my priority criteria are: – purchase price max. 4000€ better below – fuel saving petrol – lower insurance ngsbeitrag – low taxes – relatively low mileage (how much is ok with such a price?) – cheap spare parts / repertures – no car prone to the whole history still a few questions and namely: 1.) I would insure the car via my father. he already has a 2nd car. can one still take a 3rd car into the insurance? 2.) if yes, how much % and euro in the year would be expected (he drives car without accident for 30 years)? 3.) is e right s that well-known “young cars” like corsa or golf are very high in insurance? if not the corsa would be in my tighter selection. at the moment I can’t remember anything anymore. I ask you to give me some suggestions and tips and answer my questions, if that is possible. thanks already and friendly greetings lame