How to Avoid Duplicate Content on Website..?

Some of the above causes for duplicate content have very simple fixes to them:

Session ID’s in your URLs?
These can often just be disabled in your system’s settings.

Have duplicate printer friendly pages?
These are completely unnecessary: you should just use a print style sheet.

Using comment pagination in WordPress?
This feature should just be disabled (under settings » discussion) on 99% of sites.

Parameters in a different order?
Tell your programmer to build a script to always order parameters in the same order (this is often referred to as a so-called URL factory).

Tracking links issues?
In most cases, you can use hashtag-based campaign tracking instead of parameter based campaign tracking.

WWW vs non-WWW issues?
Pick one and stick with it by redirecting the one to the other. You can also set a preference in Google Webmaster Tools, but you’ll have to claim both versions of the domain name.
 
Duplicate content can be avoided by checking your website content in various online plagiarism checker tool like Copyscape. Duplicate content in harmful for your website and should be avoided to keep your website safe in search engines.
 
You can Use 301s: If you've restructured your site, use 301 redirects("RedirectPermanent") in your .htaccess file to smartly redirect users, Googlebot, and other spiders. (In Apache, you can do this with an .htaccess file; in IIS, you can do this through the administrative console
 
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