Just to add to Gulbert's comments about alternatives to Microsoft Word:
LibreOffice is indeed very good and widely praised in the technical press. (There are quite a few AB members who use it).
However by far the most well-known freebie is OpenOffice which, again, the technical press loves:
https://www.openoffice.org/
(OpenOffice is increasing being used by businesses and by others, including schools and local authorities, who don't want to fork out for Microsoft licences. It's what I use myself, even though I've got a Starter Edition of Microsoft Word on my PC. Posts here on AB suggest that it's widely used by members of this site).
The other major freebie is far less well-known (possibly because it comes from Australia) but gets equally good press reviews. It's WPS Office Free:
https://www.wps.com/office-free
Most people don't need Microsoft Office. The free alternatives are just as good and possibly even better. (For example I don't like the 'ribbons' which Microsoft decided would be a good idea in their software. OpenOffice sticks to using a traditional menu bar across the top of the page. I've also encountered very large spreadsheets, detailing the results of academic research, that Excel refuses to open but which OpenOffice Calc can handle with ease).