HN user
Retired IT specialist / Writer / Photographer
I use Ghostwriter in Linux and iA Writer on a Mac and iPad. These are distraction free Markdown editors with excellent Markdown support. I use Vim for programming but don’t care for it for writing articles. For finishing I use Pandoc to convert Markdown to Word format, HTML, or TeX.
If you’re doing technical writing for clients, they’ll frequently want your submission in Word format.
For blog writing Medium is decent. Wordpress isn’t bad either.
The C Programming Language, Kernighan and Ritchie, for its simple elegance.
The Elements of Style, Strunk & White. On clear writing.
Hitchhiker's Guide to the Galaxy (series), Douglas Adams. So you don't take yourself too seriously.