TL;DR: Know and use Markdown because it’s fast and convenient.
“What is a Markdown?” my editor asked me the other day. She is an experienced content and copy editor and has worked for magazines and book publishers. However, she is not familiar with the powerful and convenient Markdown because it’s still a rather unknown approach to publishing except for an elite circle of early adopters and technology professionals. Even the so called re-invented web publishing experience Medium doesn’t support Markdown, but many other services and apps including my favorites (ByWord and LeanPub) build their whole flow around Markdown! In fact, I’m such a huge fan of Markdown that I’m writing my daily journals in it as well as this blog post.