Relevance
A quality link will be relevant to your niche and market. Irrelevant links count but they just aren’t up to par with it comes to increasing page rank.
Context
Getting quality links that are within context are the creme of the back-link world. Do your best to get contextual links from highly optimized websites that have a lot of relevant content. Links to your site surrounded by that kind of content is prime real estate.
Difficulty
As links get more difficult to get they also get more valuable (of course within reason). You’ll need to make a fairly large investment in either relationships, content or with money to get these links. Just remember that the most difficult links are always the most valuable so seek out the hard ones.
Humanity
It seems that the less Human contact involved in link getting there is the better. However more often than not the highest quality links will require some sort of human element. That means you need to be willing to pick up the phone to call a webmaster or email as many relevant blog owners as possible or finding a way to network with fellow site owners at conferences and meetings. There’s always some human somewhere in charge of the links so find them!
Credibility
You want links that come from trusted sites with high Page Rank already. If you can get links from credible websites those links will increase the perceived value of your site by virtue of the credible site.
Authority
right there with credible links are links that come from websites that have a great degree of authority within their niche. If many people go to them for information and use them as a source of support and inspiration for their sites then you know you’ve got a great link.
Investment
Valuable links require an investment. You’ll need to put in some sort of effort whether it be actually paying for the link or doing the necessary schmoozing with the right people to get the link. Perhaps its even targeting some high quality content towards a set of high quality niches. Whatever it is the best links always require some kind of investment to get.
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