Blogging is a very powerful SEO tool when done correctly. Before you start a blogging campaign it is critical to do a bit of keyword research on all the topics you are planning on writing about. The idea behind this is to expand your websites organic keyword rankings by adding new keywords on your website. 

The recommended length per post for best SEO is 900 words. Include your focus keyword in the title, meta description, H1, website content, rename images and add focus keyword with an alt tag. These are the basic steps to getting your blog posts to rank in the major search engines. 

There are more advanced SEO techniques you can use including adding custom video and audio files to your website to create more linkable assets.