Greetings!
I use MS-Word for writing profusely. You know, I am trying to remember if it had a version of Word already installed, and I think it did - one of their trial versions that you have to pay for later on. Anyhow, if you write a lot, and if you haven't yet used Word, well, there are other programs but Word really is the industry standard.
If you are concerned about price (you are buying a computer with a pretty hefty price tag, no?), why don't you download one of the free word processors - Mozilla, the proprietors of Firefox, have a good one called "LibreOffice Writer", but there are a bunch of them that are compatible with Windows 10. Also, several of them are reviewed at this site: http://www.techradar.com/news/the-best-free-word-processor .
Good luck! I am really happy with my computer, by the way, and I hope you are, too.