The difference between "NoFollow" and "DoFollow" is that "DoFollow" links pass link juice to the target page, whereas a "NoFollow" link does not pass any link juice.
Always keep in mind to create a strong internal linking structure. Pages that pass link juice create pages with a stronger page rank.

This is why we recommend to only use "DoFollow" links for the internal link structure.

Here is an interesting link about Common SEO Mistakes and How You Can Fix Them.

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