The first thing you need to take care of is the actual source code and layout of your page. This has to be kept as simple as possible. The problem comes when AdSense and the search engines themselves begin to have troubles in extracting the most relevant keywords on your site because of a too complex layout.
If there are certain keywords you wish to target, make sure the word you wish to target is present in the title, in the first paragraphs as well as in the name of the file. While you’re at it you might want to ensure the word springs up in the page’s last paragraphs.
This takes a little while, but if, after waiting, you still can’t find your page near the top, you should try rewriting your title and your first and last paragraphs. It doesn’t take much, often just changing a few words will give you the right results.
So those are about the basic techniques in search engine optimization. You can find a lot of computer tools to aid you in doing this, and of course, Google is a great place to search for this.
In the end, you’ll find that SEO is a complex topic, and entire books have been written on the topic as well. You might find that you have a lot of optimization you need to do in order to get more and more visitors to your site and clicking those precious AdSense banners.