One way to make money with Google AdSense is by keyword targeting. As you probably already know, Google AdSense ads are contextually targeted. The Google AdSense spider / crawler / indexer searches your content for keywords and then displays ads for those keywords - contextually targeted adverts. However, AdWords advertisers pay different amounts for different keywords. Advertisers pay more for keywords where they are likely to make better returns and get more money for. A jokes page will likely have low paying ads ($0.02) whereas one about credit cards will have much higher paying keywords.

However, you should really only make content about stuff you can write about or are interested in. Also, if you have a website that is mainly targeted to a particular topic and you then put in a page about Student Consolidation to try and get a better CPC (cost per click) you will not get as much money as if you had a whole site about the keyword.

The best paying keywords are about mesothelioma, life insurance, loans, mortgages, etc. Not really the most interesting topics but if you have a blog about electricals you can get quite a high CPC and therefore lots of money.

How to implement keywords:

Find a keyword you want to target
Write an article. You must have good content otherwise your readers will turn off.
Inside your article you must have the keyword mentioned a few times
Write an article. You must have good content otherwise your readers will turn off.
Inside your article you must have the keyword mentioned a few times
The keyword should appear in at least one tag
The keyword should appear in (bold) at least once
Don't overdo the keyword targeting as Google will give you worse ads as a result so keep the tags down.