What to look for in a link?

*The page is already in the index. This is the basic requirement. If the page is not in Google’s index, it cannot pass any link juice to you. This makes linking to new sites a bad idea.

*The page has a decent ranking, one at least equal to your own. Getting links from low-ranking sites is like associating with a bad business in Google’s eyes.

*A decent linking strategy on their part. If the linking site provides links to lots of dissociated sites, there is a chance that Google will devalue its links.