In depth AdWords theory and how-to AdWords guides.
Everything can learn from the Performance tab of the Opteo app.
Every optimization task you can encounter in the Improvements tab of the Opteo app, explained.
Everything you can learn from the Segments tab of the Opteo app, and how to interpret the information.
Everything you can do in the Annotations tab of the app
Everything there is to see and do with the client list section of the Opteo app.
Everything you can change and customize in your account settings.