In the IT world you can’t just remember everything you ever do, so you need a way to set a trail of what you do. Some people write journals and some (me included) write their documentation in a wiki.
Wiki today means Wikipedia, Wikipedia runs MediaWiki software which is a huge piece of software. In order to run it you need a database server and maintenance from time to time.
What I propose you today is docuwiki which is a small footprint wiki. I suppose you already have a webserver with a running php instance.
Installation is very easy, just download your wiki software:
wget https://download.dokuwiki.org/src/dokuwiki/dokuwiki-rc.tgzand unpack it:
tar xzvf dokuwiki-rc.tgz mv dokuwiki-rc-2020-06-09/ dokuwikiThen point your browser to the folder you unpacked it into and run the installer
Your new wiki is ready. You can start writing your pages