Forum Moderators: open
Seriously, start here.
Honestly, many "expert authors" use this forum's informal expertise to publish their formal expertise.
Absolutely, many of the web (SEO) tools on the market have a knowledge database which again use WebmasterWorld as the choice for providing new knowledge tips to their customers.
The forum's search function can help alot to catagorize your learning curve.
This [searchengineworld.com] is a good after read and shows the importance of lean and mean pages - and to quote Brett from earlier "Content is all that matters"....the rest is just fat code :)
ciml's theme/PR pyramid thread [webmasterworld.com] is another great read...similar to the forever-referenced theme pyramid thread [searchengineworld.com] by Brett.
Otherwise as fathom says - everything you read in here is all good usually - unless its a google update...and hence why most of the above mentioned pages are google related! :)