I got introduced to it in the R site.
Links, formatting and tables. Tables are awesome.

I use Markor on Android. The search/replace feature's regex option makes formatting data into tables easier.

What is your current setup for .md docs?

I am using VS code with the grammarly extension for editing, then have a mkdocs static site generator from the docs and then to create a PDF version, I am using pandoc.

I've had great fun working with converting md files to PDF with pandoc. Only annoying element is that it needs a pdflatex engine to be installed also.

Quite a nice clean markdown editing tool with split views like OverLeaf.

www.hackmd.io