Google AdSense Help Center

https://www.google.com/adsense/support/?hl=en

Interested in AdSense

What is Google AdSense?
What's the difference between AdWords and AdSense?
What is AdSense for content?
How does Google target ads to my website?
How quickly will Google ads start appearing on my site?
Can I filter the ads that are displayed on my site?
How do I generate earnings?
How much will I earn through this program?
What is the AdSense revenue share?
How much does AdSense cost?
What is AdSense for search?
How do I earn with AdSense for search?
What languages does AdSense support?
What makes Google AdSense different from other ad networks?
How does participation in this program affect my site's position in the Google search results?
How can I advertise on AdSense sites?