Looking for a golf r

Hey guys i was looking for a first car at 21, obviously will be buying it with the help of my parents and paying the rest off myself i dont mind having a used one. But i wanted to know if there’s any problems to be aware of or costs that will come as a surprise. And was also looking at the gti cause its a lot cheaper the 2024 model is out of the question for me as its 65k and i dont want to pay that off i have a budget of 30-40k and will be buying it cash splitting 20/20 with my parents.