I'm considering buying a laptop for office purposes, what should you look out for when buying? Should only be used for Ms Word?

For Ms Word apps like word, powerpoint, excel and etc.

Clarify what exactly you want. How much storage space. How fast to work. Etc.

And then pay attention to the processor, RAM, storage capacity. The connections could also be interesting. Find out more on the various IT pages.

Do you know how much such a laptop can cost for office matters?

Depending on how much storage space you need from around 300 euro

I would recommend the Honor magicbook 14 or 15. The offer costs around 500 euro. Super chic, nice and light and lots of power. Also for more than office. Otherwise, there are also some for less money, but they usually can't do that much. So under 400 euro I would buy used.