Kristi Hines has put together this list of (reputable) blogs, articles and tools around the topic of SEO and link building.
For many tech founders, SEO is associated with spammers, direct marketers, and other "social media experts" - i.e. fluff. But that's a one-sided view. People like Patrick McKenzie demonstrate that SEO can be an extremely powerful part of your toolset.
This list of links, along with Patrick's blog is a great starting point if you want to learn more about SEO and link building.