Originality - Focus more on the originality of content and on a consistent basis. It is a habit you will need to cultivate.
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.
Research: Use blogs that publishes content that is based on research ans is relevant to what your topic is.