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.
Popular Topics: Stay updated with new topics or popular topics on other blogs you follow.
Tags: Use of relevant tags is important from the SEO perspective. It helps the search engine track your post based on the tags you use.