Soon my apprenticeship will start and I had to buy a laptop for 400 euro. It would be nice if you could send me links of those that have a good performance for the price. It is clear to me that such a computer is not designed for gaming, but I would still like to get the best there's for 400 euro.
So if you want something special, I recommend a thinkpad, completely overhauled by the seller or, better, by the manufacturer. You get a lot of performance for the money. As you already wrote, this is no gaming, but something decent.
I would also recommend a Thinkpad. There are good refurbished devices here, e.g. This one
https://www.esm-computer.de/lenovo-thinkpad-t460-core-i5-6300u-2-4-ghz-8-gb-240-gb-ssd-full-hd-webcam-b-ware-1019546/