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.
Keyword search: Take up a keyword search for the blog posts you are writing. Choose the ones that searched often and have less competition.
E-commerce bloggers must carefully write keeping their audience in mind. Everything you post on your blog will speak for your product or service. Your interaction with bloggers in comments and otherwise will give you a direction.