www - blog source in Markdown
docs/ - static blog build in HTML/CSS/JS
% cd www
% hugo new post/start-of-summer.md
Will automatically refresh to show your changes as you make them in Markdown.
% cd www
% hugo -D server
This will build the docs/ site (HTML/CSS/JS content) from the markdown in your www/ source.
% cd www
% hugo -D
Always build, then push to GitHub to ensure latest blog changes show up in my blog.