Quality Over Quantity
Backlinks are all about quantity! You can have thousands of backlinks to your site, but they’re all spam they’re not going to help rankings. You want to focus on backlinks that will actually provide value to your user.
Relevance Over Quantity
Relevant backlinks are important because without relevancy there is no gain. Your focus should be on building your own authority, which can’t happen if the links (even if they’re from high authority sites) don’t relate to your content.
Follow Over No Follow
Follow and no follow links can be a little tricky. But when a site links to you and doesn’t allow the link to be followed by crawlers (nofollow), it’s not passing the authority that a followed link would, therefore making it less valuable.