AdSense Tip 1: Find Best keywords for your contentBefore serving ads on a web page, check its keyword density. You can find many free keyword analyzer tools in internet searching the word "free keyword analyzer".
AdSense Tip 2: Improve your keywordsGet keyword suggestions from Google AdWords Sandbox. Get new keywords that can help you improve your ad relevance.
AdSense Tip 3: Make content rich websitesThis means that content-rich websites of a popular topic should attract a large amount of ads.
AdSense Tip 4: Write a new page/blog post every dayThis is very important. The more content you have, the more visitors you will get. Put an Adsense unit on each and every content page of your site.
AdSense Tip 5: Choose the right AdSense formatThe top three AdSense formats are for many webmasters:
336x280 large rectangle
300x250 medium rectangle
160x600 wide skyscraper
Another successful format is the 728x15 horizontal ad links, that can be placed under your navigation bar.
Use "Allowed site" feature of adsense to protect yourselves.If anyone put adsense codes in their websites you must not worried about it.
AdSense Tip 6: Adsense Color tipsWhen creating your Google AdSense ads it is recommended to use the color scheme and style of your website so that the ads blend in well.Google Ads with no background color and no borders will always perform better. Make the border color and background color same as your page background color.
AdSense Tip 7: Position tipsPlace the AdSense ads in a prominent place around the top/left part of your page or under your headlines.
For short articles, CTR is best when ads are placed just above the content.
For long articles, CTR will improve if you place ads somewhere in middle of the content or just where the article ends.
Use Text Ads instead of Image Ads as users get more options and the payout is often higher.
Important:Don't places images next to Google ads as that will invite a permanent ban to your AdSense account.
AdSense Tip 8: Increase the number of ads, but not too muchIf you have a lot of text on a page, use multiple AdSense units. You can use up to three AdSense units on a page, two AdSense search boxes and one unit of ad links.
AdSense Tip 9: Preview Google adsYou can find out what ads will be served by Google AdSense if you install Google AdSense Preview Tool, a very simple tool available only for Internet Explorer 6.0. Click to advertiser sites without generating invalid clicks, and easily add their URLs to your URL filter list. Because AdSense uses geo-targeting, Google serves different ads for other countries.
AdSense Tip 10: What not to do with adsenseDon't click on your own ads
Don't ask others to click on your Google ads
Don't manually change AdSense code
Don't place Google ads on sites that include prohibited content (e.g.: adult sites)
Don't employ cloaking, hidden text or farm links
Don't use AdSense ads on the same page with similar ads (e.g.: Yahoo Publisher Network)
And also don't refresh your site excessively.