HTML has emerged as a general-purpose prose markup language. There are other MLs for specific industrial and scientific applications, but probably 90% of the time, HTML is sufficient.
At this point I remember assuming that a markup language was all-encompassing; that you get HTML, then CSS, then that's it. I assumed programming languages were a type of markup, but really they're a third piece of the pie.
One of the key pieces of software we will use with markdown is Pandoc -- the "universal document converter." https://pandoc.org
Love that this was immediately explained!
Old fonts are sometimes terrible
And some new fonts--made in a rush by excited designers--have basically no marks available.
There are lots of different kinds of content management systems. Wordpress is one kind. Dropbox is another kind. Github is another. Each makes slightly different trade-offs between the kind of flexibility it offers, against how far it breaks the paper-document metaphor.
One I've seen discussed regularly is Gmail, in that it doesn't use folder systems at all, just labels/tags. This is a bit of a flawed system (as is everything) but it's well-used and most students will be familiar with it.