When filling your website with content you should not copy and paste content from other websites at any time. The biggest search engines call this “Duplicate Content”. And the result of having duplicate content is decrease in rank on Google or other search engines.
Google wants to show the best results to their visitors. When the content shows up at multiple websites it is not efficient for searchers to click at all the links. That why Google “promotes” the websites with unique content with a higher rank than the websites that copy and paste parts of their content. The websites with duplicate content often show up at page 3 or lower and this prevents users from clicking because visitors of Google often don’t look at page 2 or lower. Most of the time the websites with the Unique content have more links than websites with duplicated content.
Google can also notice duplicate content on the same website. This can happen if you have a blog and use your full text on the homepage and on a post page. But this can also happen when your content is available trough other urls. This is a thing you should watch out for since you don’t want to de-rank your own website with originally unique content.
There is only one solution for this problem that a lot of webmasters have: Write your own content and use it only one time on one page of your website. Also you have to be carefully when copying small or large amount of text. When copying multiple content and pasting it in one page it will also get noticed as duplicate content.
Another great way of preventing duplicate content is by using url redirects. You can choose to redirect all duplicate pages with a 301 redirect to your subpages with the same content. Google recently created a new way of preventing this by usingtags in your head. This will only work when the content is on the same domain but is a great way of preventing duplicate content on your own website.
This will not affect your Pagerank and other relevant services.