English version: I always "loved" people who like to present themselves as ultimate authorities and acknowledge only their own knowledge. People who really knows a lot are always aware that they don't know everything and they are much more modest in its own life.
Also, these people are more willing to share that knowledge and are not afraid that someone will "steal" their positions and knowledge.
Here I would just like to mention some of those great guys.
People that I am learning SEO from:
Ed Dale and his great "The Challenge".
Dan Richmond and his great online book "SEO in Practise".
Vladimir Prelovac and his excellent blog "Vladimir's Blog"
Istok Pavlović and his excellent blog.
Thank you guys for sharing all these information!