I stood up a dokuwiki instance recently and then documented how to stand up dokuwiki, haha.

I disabled revision history viewing and have a public portion and a private portion. I use it to track things I'm learning and document rollout procedures and commands I need for things. So far I have rclone backups into S3 Glacier, Tuwunel(Matrix) server deployment with voice/video support, and various little tutorials on server stuff I'm learning.

TLDR use a wiki!