I have to get a new PC, not a laptop. This I mainly use to watch movies, sometimes even a Youtube video and to surf the Internet. Facebook etc. What do I have to look out for so that I can do these things in a good quality?
The question is how much money you want to spend. You will certainly get a laptop for 200 euro, where you can watch videos on it.
For SSDs: from 128 GB
For hard disks: from 2 TB
Basically, every one of these still so cheap new PC fills you. If you want to be more future-proof on the way I advise to a computer with Ryzen 3 2200G 8GB RAM as well as a SSD. PCs with this equipment you get from about 300 euro.