In my opinion, buying already used laptops is not very profitable, because if the laptop is dusty old and with extra files, then most likely it will be very slow and will be defective. I would consider buying a new but more budgetary option if you don't have much money. Now there are a huge number of services like
https://gadgetguide.in through which you can find a decent and not expensive laptop model for any use. True, it is important to understand that the quality depends on the price and how long the laptop itself will live. So personally, I would not spare money for a computer that I will use almost every day. Although everyone has their own choice.