Programming

No worries, sounds like you're definitely on the right track with your approach.

In terms of the style of editor I don't have a strong preference, I think the most important thing is discoverability which generally means putting docs where they are expected to be found and using whatever your team or org is using. Personally I have a slight preference for markdown mainly because it's easy to version control, see who wrote what (so I can ask them questions) and use all the tools I'm used to that work well with plain text. Tools that use more WYSIWYG style can be good too though and many of them like Notion have the advantage of making it relatively easy to search across your entire companies documentation assuming everyone uses the one tool.

For my personal notes I use Logseq which I highly recommend. It's a bit of both, markdown under the hood but with a simple editor that lets you focus on writing notes, tasks and links.