I found Craig Mako's Fast Attack SEO WSO to be the best investment I ever made in that area. It came out about 3 weeks ago.

Applying what you have learned in SEO is a good practice. If you do not have any ideas on how to do it, you can search it in the internet.

After getting knowledge you should practice your techniques on the different website to see the results then you will judge very easily that what you have found.

"Knowledge without practice is useless. Practice without knowledge is dangerous"

Confucius

SEO Book from Aaron Wall is a great read, BUT it's quite long..

Actually applying that knowledge is the next step...knowledge is worthless if it is not used to achieve one's goals.

you can learn about all type of seo techniques and implement that techniques upon your sites, such as on-page and off-page optimization. you can do both

Depends what you want to do or how you want to do. See, you can gain experience in an SEO company then you can start your own business after sometime. you can also buy a domain and start optimizing it to test your knowledge. there are thousands of things you can do, it all depends on you.

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After getting SEO knowledge, you should start using this knowledge to earn on internet by serving as a freelancer or promoting your own websites joining CPA networks. Working as freelancer SEO will start paying you immediately.

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You can SEO a website and can earn good ranking over Google for any website.

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If you get enough knowledge then try to implement it.

SMO and PPC are the next stops after seo for everyone,