I would suggest not bothering, you missed the boat by a few years. Develop a real product or service and leave the SEO of your business to trained professionals. It's a tough world out there for n00bs
Well, I would say forums are also good place for learning SEO if you are visiting this forum on regular basis you would learn a lot of things....
FORUMS are great as long as you don't post SUCH questions!!! Go read articles online, but not only read, try to FOLLOW them and make everything yourself. This is the best way to do this!
Start learning online tutorials. Google webmaster Blogs are very helpful in learning SEO. But if you have website then go for professional Seo experts for better results rather than trying yourself if you do not know much.
There are great sites that provides basic & advance SEO information like seomoz, also forums are good sources for knowledge of SEO.
Dont ask many questions, People may get irritated.. But follow up the other questions and read then and understand the things... SEO is not what you learn, It is what you gained with the experience.. There are nothing as such limitations and barrios, You can do anything just be sure the thing you do will fruit you after few weeks/months/years... SEO may take time so you need to have patience... I have a book for the beginners which guides for the OLD technique and new Technique SEO. i can share with you... But remember do few experiments and learn from your own...