Linux is a platform based on so called Linux kernel and unix like system layout and utilities and majority of software tools available there comes either from original unix platforms or the community. Where people from community time to time form also commercial projects and release software under somewhat closed source license, majority of linux software that is not part of the unix heritage originates from opensource community and enthusiasts.
Regarding office software... around 1990+ somewhat association so called OpenOffice formed and when you search it on the internet, https://www.openoffice.org/ still exists and you can get the software from there.
During the years there were some cooperation and misunderstandings during the development of the project and there were some stages when the OpenOffice project changed and become LibreOffice software package ... while this overal initiative was dropped somewhere along the road and now both OpenOffice and LibreOffice office software packages (exist for all to use, as both of these packages are distributed to most of the meaningful platforms today.
for sure uncle google if you ask him like "office software best free linux alternatives" will reveal a lot of similar content.
just three first links ...
https://linuxhint.com/best_ms_office_alternatives_linux/
https://itsfoss.com/best-free-open-source-alternatives-microsoft-office/
https://www.ubuntupit.com/top-10-best-free-office-suite-software-as-ms-office-alternative-for-linux/
while these days number of online services exists for the same.
Have a nice day.