(by pio dal cin) +Google has a wonderful book (free for limited time) that would help you understand tools and resources and how to improve your SEO skills. +Google says
"Google produces wonderful no cost resources on SEO, AdWords, and Google+ for small business. (Free review copy of 'Free Google' at http://bit.ly/freegoog). This new book identifies tools, learning resources, ways to search Google for help, and even hidden treasures for better SEO (search engine optimization), AdWords, and Social Media Marketing (including Google+ for Google optimization). If you are into Google Analytics, Webmaster tools - anything by, about, for Google - this is a 'must get' guide. Hurry! As it won't be free forever!"