Adding Meta tags is one good procedure for SEO. These meta tags should be unique for each posts and that makes the search engines to know more about your individual blog posts and make them crawl and index your pages better and it also improves your Search engine rankings.
Procedure to add meta tags -
This is for Home Page
Login to Blogger > Layout > Edit HTML.
Search for following
<b:include data='blog' name='all-head-content'/>
Add following code JUST BELOW above line
<b:if cond='data:blog.url == "http://free-blogger-help.blogspot.com/">
<meta content='DESCRIPTION' name='description'/>
<meta content='KEYWORDS' name='keywords'/> </b:if>
Now procedure to add meta tag to any post of your website e.g. http://free-blogger-help.blogspot.com/2008/07/increase-traffic-to-your-blogger-blog.html
<b:if cond='data:blog.url == "http://free-blogger-help.blogspot.com/2008/08/list-of-useful-blogger-widgets.html">
<meta content='Type you post description here.' name='description'/>
<meta content='Type, the, post, keywords, here' name='keywords'/>
Repeat above step for as many blog posts you want to have unique META Tags for.