Review on Wiki.js by Joseph Long

As is said, it's very simple to use in comparison with other editors like Wordpress or Joomla! It can handle multiple content pages, so you don't have to worry about adding new content when you're editing an already existing page.

The editor sometimes doesn't load well when the number of edits increases, but this issue only appears after some time. If you want someone to edit your website regularly without worrying that anything will go wrong if something goes missing from their computer for any reason, then wiki is definitely what you need. I've been using it as my CMS editor since 2015 and never had problems with it.