Imagine each webpage on a website is at the center of a huge maze which Googles search engine spider (GoogleBot) has to find it’s way through via internal links, via the internal navigation links.
If there’s only one long path to the center of the maze (that real deep webpage you want indexed) in amongst thousands of other long paths, Google might never find the right path. Make it Easy for Googlebot to Navigate your Link Structure.
More paths (internal links) there are to a webpage, more likely and often Googlebot will spider a specific webpage.
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