Tryangled Dev

Paid links are simply text links for which the webmaster of the linked site paid. Paid links can be used to advertise your web site on other sites.
Most webmasters buy links to increase their search engine rankings. Unfortunately, Google doesn’t like paid links.

Hidden links are links that can be seen by search engines but not by humans:
·    White text on a white background (or any other text that has the same color as the background).
·    Links that have been changed with CSS so that they are extremely small.
·    Links in invisible CSS divs.
Its risk to use hidden link . Google will drop your site .