Include data in blog posts. It makes the post more interesting and informative to read. It makes people stay longer on your pages and even share your content.
Grammar - Depending on the language you use, blogging just makes it imperative that you are reasonably good with your grammar skills and proficiency if not a master. Remember your audience is a mix of both; the ones who are experts and the ones who are not.
Series of articles - Create a series of articles on your blog if the subject you choose to talk about is an extensive one.