You used to be able to prevent losing link value to unimportant links by giving them a 'no-follow' tag. A 'no-follow' tag asks Google not to follow the link: so no link value is lost. Now you might think: "I'm going to 'no-follow' less important links to give the most important links more link value." While this worked in the past, Google has become smarter. Now it seems that the link value for the whole page completely disappears when you add a 'no-follow' tag to a link on it. Therefore it makes more sense to have fewer links on a page instead of 'no-following' some of the links.
(Article Source: https://yoast.com/internal-linking-for-seo-why-and-how/ )
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