You should always include a few links to authority sites in your niche. In order to keep the link juice on your page or site and not lose some of it to the pages you are linking to, you should always add the nofollow attribute to the outbound links on your posts and pages.

It is very simple to do, simply add rel=”nofollow” inside the HTML code.

Here is an example for a link without nofollow: [a href=”http://domainname.com”]Domain Name[/a]

And here is what it would look like with the nofollow enabled: [a href=”http://domainname.com” rel=”nofollow”]Domain Name[/a]

All of the affiliate links on your sites should also be NoFollow links.