Add Meta Tags To Each Blogger Post for increase more traffic

Navigate to Design->Edit HTML. As usual, create a back up of your template before you make any changes to the template. Once the back up is done, proceed to step 2.
 
Search for the following piece of code in your template.

<title><data:blog.pageName/> | <data:blog.title/></title>

Paste the following piece of code just below the above line mentioned.

<meta expr:content='data:blog.pageName' name='description'/> 

Your blog is ready to get a little more hits than before.

OR 

Find following any code in your blogger HTML template.

1. <b:include data='blog' name='all-head-content'/>

2. <b:if cond='data:blog.url == "http://YOUR-BLOG-URL.com/"'>
<meta content='DESCRIPTION' name='description'/>
<meta content='KEYWORDS' name='keywords'/>
</b:if>

Add this code just below that line:

<b:if cond='data:blog.url == "http://YOUR-BLOG-URL.com/2008/08/bla-bla-bla.html"'>
<meta content='Type you post description here.' name='description'/>
<meta content='Type, the, post, keywords, here' name='keywords'/>
</b:if>
 

Replace http://YOUR-BLOG-URL.com/2008/08/bla-bla-bla.html with the URL of the specific post you want to change the META Tags of.

Repeat Step 3 for as many blog posts you want to have unique META Tags for.