the workings of this meta tag is the technique of generating each description and keywords on your articles automatically, this technique can also be used as a solution to prevent duplicate meta descriptions on your blog.
If you use a template that no meta tag keywords and descriptions, you should put it up on your website as this will greatly affect the SEO of your website.
How to apply only for those of you who have never completely install the meta tag.
1.for the first phase goes into your blog account, and then select the section Layout > Edit Html.
2. then look for the following code<title><data:blog.pageTitle></title>use CTRL + F to search for it.
3. If you found the code, then remove the code and replace it with the code below.
<b:if cond='data:blog.url == "http://YOUR ADDRESS.blogspot.com/"'>
<title><data:blog.pageTitle/></title>
<meta name='description' content='ENTER A DESCRIPTION FOR THE HOMEPAGE OF YOUR BLOG'/>
<meta name='KEYWORDS' content='ENTER THE KEYWORDS FOR THE HOMEPAGE'/> </b:if>
<b:if cond='data:blog.pageType == "item"'>
<title><data:blog.pageName/> - <data:blog.title/></title>
<meta expr:content='data:blog.pageName + ", " + data:blog.title + ", " + data:blog.pageName' name='Description'/>
<meta expr:content='data:blog.pageName + ", " + data:blog.title + ", " + data:blog.pageName' name='Keywords'/>
</b:if>
4. then save your template and see the result.<title><data:blog.pageTitle/></title>
<meta name='description' content='ENTER A DESCRIPTION FOR THE HOMEPAGE OF YOUR BLOG'/>
<meta name='KEYWORDS' content='ENTER THE KEYWORDS FOR THE HOMEPAGE'/> </b:if>
<b:if cond='data:blog.pageType == "item"'>
<title><data:blog.pageName/> - <data:blog.title/></title>
<meta expr:content='data:blog.pageName + ", " + data:blog.title + ", " + data:blog.pageName' name='Description'/>
<meta expr:content='data:blog.pageName + ", " + data:blog.title + ", " + data:blog.pageName' name='Keywords'/>
</b:if>