Domain names are another great place for keywords. If relevant keywords are contained in the domain name, it carries more weight with almost all search engines, than keywords found in the text of the webpage. Shorter or top-level domain names with keywords generally carry more weight than really long domain names. For instance, if all other factors are the same, the domain name www.InternetMarketing.com would rank higher than www.MarketingOnTheInternet.com, for the keywords “internet marketing.” More recently, search engines have begun to prioritize the use 
of keywords in a site's domain name, in their ranking formulas. Google and Yahoo! are two of the search engines that do this.
Also avoid search engine spamming. That is, don't be tempted to use tiny or invisible text to put keywords at the beginning of your pages. Search engines define this behavior as spam and can reject your site for it. Also sites that list keywords and/or repeat them over and over can also be rejected for keyword spamming.
Meta Tags
The meta description and keyword tags are another great place to use keywords. They describe your site's content, giving search engines' spiders an accurate summary filled with multiple keywords. Meta tags are hidden in a document's source code; the search engines can see them, but they visitors can’t (unless of course they view your source code). Some search engines, however, use it as a site's summary on their results pages. If they do, the reader may actually see this hidden tag, so make sure its contents are somewhat enticing to the reader.
Meta tags are incredibly important to some search engines and others couldn’t care less about them. There are a handful of search engines that use only meta tags to rank webpages, although the weight of meta tags in general is dropping across the board. Search engines don’t penalize sites that use meta tags properly, so it's recommended that you always include them.
The meta description tag should contain multiple keywords organized in a logical sentence. Place the keywords at the beginning of your description and close to each other to achieve the best possible rankings. Search engines vary in their preferred size for meta tags. Anywhere between 150-250 characters is the standard accepted size.
Google AdSense can be considered the other half of AdWords. AdSense allows website owners to feature relevant Google ads on their website which matches user profile with the profile requirement of each ad and also allows website owners to EARN revenue via the traffic generated by website. Each month, Google will send you a check based on how many clicks your ads generated.
Google AdWord is a pioneering as well as an inexpensive advertising venue when it comes to business in order to advertise products to the targeted audience. They have the ability to take control of their budget that is based on keywords. What's more the advertisers are also able to determine the ad contents as well.
How to Make Money with Google Adsense
Google Adwords Advertising Keyword Tool
