There are a few rules to follow when purchasing backlinks, which will assure the success of your website. First of all and most importantly, you should never buy backlinks on an irrelevant website because nobody will click on these links so they will be useless. You shouldn’t restrict yourself to only buying .gov or .edu links; there are many other high-authority or high page-rank websites out there. Never buy backlinks on websites where your competitors have listed theirs because it is unethical and since the other links have been there before yours, visitors will avoid clicking the link to your website. Only purchase backlinks from websites that are very popular and have high traffic; also try to get backlinks listed for as long as possible.

Last but not least, you shouldn’t build or purchase too many backlinks in a short period of time, because otherwise search-engines might label your website as spam and you will not appear in the search result list at all.
Before you buy backlinks on any website, you need to determine how important that specific website is to your niche, how much traffic it generates and of course, what ranking it has on search engines, to make sure it is a good investment which will mean more visitors and therefore more profit for your business!