Tips for Internal and External Page Links
Briefly

Links remain critical for organic rankings despite suggestions to the contrary. However, internal links specifically signal a page's importance and help convey its relevance.
Internal links are vital for rankings because they signal to Google the relative importance of a page and provide contextual understanding through anchor text.
While there is no maximum for internal outbound links, links within the body of the content are valued more than those in navigation or footers.
Google representatives have repeatedly stated that there is no limit to the number of internal links, indicating flexibility in how site owners structure their content.
Read at Practical Ecommerce
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