A google friendly site structure spreads builds link equity to internal pages and allows them to rank better in Google over a prolonged period.
Link to important pages on your site often IN TEXT CONTENT.
If you have a large ecommerce site, consider a directory structure setup - Home > Category > Sub Category > Product (and link to related products on product pages).
Be careful not to create spammy looking internal link structures and be rewarded with a 'penalty'.
It's incredibly important to add a great diversity of keywords to your internal link profile (I think)
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