Program policies, Terms and conditions - follow these rules.
Adsense FAQ - The Adsense support centre for official guidelines.
Adsense Tax information - how google collects and uses your tax information
Adsense Taxes - a free resource about paying income tax on Google Adsense Revenue.
15 Common Adsense Mistakes - Avoid these errors that could get your adsense account banned.
Ad formats - Official list of different types of ad formats you can use.
Webmaster Guidelines - will help Google find, index, and rank your site.
Report a policy violation - If you notice a site displaying Google ads that you believe is violating program policies, let them know.