how to become an SEO specialist? is it a good carreer opportunity? are there any good companies which specialise in SEO?

ANSWER TO THE ABOVE QUESTION It is a quite good career opportunity to become a SEO specialist. There are numerous ways to become a SEO expert. http://clickwisdom.com/23/27-ways-to-become-an-seo-expert-part-1/ This link offer some tips to improve the SEO skills, and helps to know in details about SEO skills.