Earning Money from blog can be managed by using different third party Advertising companies. Google AdSense is one of the best among them. However, a tweak is needed to maximize the earnings from AdSense.
Earning Money from blog : Understanding the basics of Google Adsense
Google AdSense pays its publishers by a PPC (PayPerClick) system. This means every click on the displayed advertising brings money. This system is determined by an algorithm which is unknown. Highly sought-after keywords naturally bring more money than keywords that interests no one.
Google AdSense provides extensive information on how to start and how to increase revenue.
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Earning Money using Google AdSense : Value of Keywords
You can use Google Trends to understand the volume of search for particular Keyphrases.
High paying Keywords / KeyPhrases can fetch big money on less clicks, but keep in mind, for highly priced Keyword / KeyPhrase, the competition will be very tough! Best of the best SEO methods will be applied by the ripe-webmasters to get more money.
So, keep your target to mediocre keywords and do the SEO accordingly for your particular post for earning money.
Earning Money using the trick of Ad unit positioning
Google AdSense Policy clearly says, “Advertisements should look like Advertisements”. Do not try to deceive the visitors with malpractices for earning more money. If one visitor complains against a publisher, it s not impossible to get banned by AdSense for violating their policy.
Inside content will have very high CTR. It is probably best to keep only one Google AdSense Ad Unit, only inside the content if the traffic from Search Engine is very high (>1,00,000 unique visitors/day). It will increase the bid among Advertisers to get the place plus CTR will be high.
However, for the most; two Google Adsense units work better.
In future articles, we will discuss on how to use the Channels in AdSense properly to increase your revenue.

I have Adsense on my website. Can I use other Advertisers on the same site?
Generally yes.
Check if it is contradicting any Adsense policy. Adsense has no problem with Tribal Fusion, Chitika, Technorati Media (now Right Media), LakeQuincy Media etc. Generally almost all other Advertisers have the answer on the FAQ section like “Can I use with AdSense?”