- Do you mean a laptop or a desktop? With a laptop the screen size and resolution might be important, with a desktop that's just the monitor that determines it.
- Does it has to be new? Or is refurbished OK? And how about second-hand?
- Do you have any preference for OS (Windows, Mac, Chrome)?

For watching series there's also the issue that Netflix in certain countries (don't know about Norway) has some content in 4K. But a 4K laptop probably is too expensive for you.

Kees