I'll just explain the way in order not to duplicate content, do we have to put up Tags rel = 'canonical' this? do not worry, I'll give you a few tips for how to installation.
How to Install Tags rel = 'canonical' in Blogger
1. Log in your Blogger 2. Click on the blog who want to edit3. Select the menu template4. And than Click Edit HTML5. Find code <head> can make it easier to use CTRL+F ( Find )6. Copy the code below and paste the below code <head>
<link expr:href='data:blog.url' rel='canonical'>
7. Click Save
Hope it helps you to avoid duplicate content
