Blog SEO is the practice of optimizing a blog’s content, site architecture and HTML code for search engines. Common tasks associated with blog SEO include on-page optimization, installing plugins, improving page loading speed and internal linking. Search engines are a super important traffic source for blogs. Our own blog is living proof of the power of SEO. Sure, we get a fair amount of traffic from Twitter, LinkedIn, email and direct traffic. And added together, these sources make up the majority of our monthly traffic.