Most blogging sites use WYSIWYG in editing. For normal users, this is more than enough. WordPress, for example, has a good post editor with option of HTML for extra formatting…
I’m pretty sure most writers know about this language. So, I apologize in case I’m repeating some known information. The internet is also full with a lot of comparisons about the best software in this field – such as iA Writer (my preferred one) and Ulysses or Scrivener (preferred by novels/books writers).
Personally, I’m into Web Designing since long time ago. Thus, formatting my posts using HTML is much easier for me than Markdown especially with languages that are Right to Left (e.g., Arabic).
In WordPress, you may need to go to the settings to enable Markdown in your posts.
If your post contains a lot of math formulas, learning this typing system is a huge plus. Yet, HTML can do a lot here, LaTeX is much easier and more common in this field. Luckily, WordPress, supports LaTeX.
Most Markdown editors supports LaTeX. MS Word and Apple Pages also do.
So, do you use Markdown and LaTeX in your posts or it’s only the simple WordPress text editor?