There are 3 principals factors(inbound links to a page, content of the page and outbound links of a page)
Inbound links are very important because you get pagerank from them, it is good that the page that link to you is a theme related webpage.
There are two properties in the content of a page very important : size ( at least 80 words and density [at least 23 words of separation between identical words] )
And finally, the outbound links dont have to be to rx sites , gambling sites or banned sites.

Are you agree?

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