Google AdWords Learning Centre
http://www.google.com/adwords/learningcenter/
If you're an AdWords advertiser, Google Advertising Professional, or just interested in learning more about AdWords, you can use our free training to sharpen your AdWords knowledge.
There are multimedia and text lessons to match your preferred learning style.
While lessons are organized to build upon previous ones, you can skip between topics and take them in any way you like. After each lesson, test your knowledge by taking a quiz.
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