Octopress is not very active. Nor do I intend to update this.
It is said very eloquently on Octopress home page and I quote
I would primarily cover blogging basics first, assuming that, you are already all set with Octopress
There are various formats in which one can blog an article. My preferred format is Markdown. Primarily because I want to master it. Other format that I use is HTML. You can mix and match formats.