How to add Different Meta tags to Different Blogger Posts

Login To Blogger Go To > Design > Edit HTML.

and mark the tick box "Expand Widget Templates"

Then, find (CTRL+F) this code in the template.

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

and add this code just below that line

<b:if cond='data:blog.url == "YOUR POST URL"'>
<meta content='DESCRIPTION' name='description'/>
<meta content='KEYWORDS' name='keywords'/> </b:if>

Then, just change text in blue with your own text.

Now, what you have to do is pasting the above three lines below the present code and changing the link,description and keywords.
You can add different meta tags to as many blog posts as you can.