One of the best SEO secrets I've learned (which took a while) is how to implement what works best and leave the rest alone. Trying to read and stay abreast of everything regarding SEO is a futile venture--it's as much art as it is science, and few 'secrets' exist.
There are large components of SEO that are open to grand interpretation and it's often hard to separate good information from mis-information from out-dated information from just plain flase information. (If you ever get the opportunity to attend PubCon or an SES conference and listen to the bevy of conversation and opinion happening all about you, the quickl realization is that there are few fast and hard rules.)
There are several camps that will advise you a bit differently in all aspects of SEO: some will claim that their methods are proven, others will be more humble and offer a "best-practices" approach sans the 'guarantee'. I often believe I'm only as good at SEO as the success I had yesterday.
Try to find what works for you inside your vertical and then cherry-pick tips from the rest of the SEO community as you see fit. Translation: there is no magic bullet! 
Here's to future success!
