General Meta Tag defined

A meta tags purpose is for spiders to gather a little bit of information about your site to help it decide where to place you in search engines along with many other things as well. Many people believe that the meta tag is not important but don't listen to them. The meta tag is extremely important. It allows you to have a better chance to gain in search engines as well as gives appropriate information to google and other engines that read from the meta tag (MSN, YAHOO, etc).

You can and SHOULD add a meta tag for every single page on your site. Each one will be different depending on how different the keywords are on that page. There is the possibility where you won't be able to add meta tags to all pages. Often if you are running a site that runs a lot of SQL call ups on pages you won't have a page file of a lot of areas of your site. This is common with online arcade sites, video sites, and other functional sites that record stats and information from visitors. Regardless put a meta tag into as many pages as possible.

Irrelevant meta tag = no traffic forever

If your site is about dogs and you have keywords, anchors, or in the description about Brad Pitt because you find that that keyword has huge searches then google will know that it's total junk. The spider will go through your pages and it'll find that there is no words that have anything to do with celebs or brad, and it'll throw your site so far down the “PIT” of google it'll never be found be even by the greatest pet lover in the world. I realize that there is so much to it that you may make a mistake and that's ok. You have to crawl before you run. It's not something that happens overnight. eventually you'll be seeing that certain keywords you put in are getting traffic and others are not. It's a long process. Maybe you'll see you are getting traffic from a keyword that is not from anything you tried and you could try to put it in your meta tag and throughout your site. Experimenting is good. No site is the same. In time you'll know your site like the back of your hand.

Please click on the top links above to learn and understand how to make a meta tag, where to put it, and if tricks of optimizing it for traffic