What is the rough rule of thumb for the ratio of internal links to your core pages?

The 80/20 rule, or Pareto Principle, is a common guideline in SEO for internal linking. It suggests that roughly 80% of your internal links should point to your 20% most important pages (core pages, high-value content, commercial pages) to distribute PageRank and authority effectively. This helps search engines understand the hierarchy and importance of your content. Pointing 100% of links to only commercial pages would create an unbalanced site structure, neglecting other valuable content. Giving all pages equal links dilutes the authority passed to your most critical content, making it harder for search engines to identify your key offerings.