Similarly as with essentially all parts of SEO, there are no unmistakably characterized "rules" with regards to keyword density. You won't discover any rules from Google that disclose to you precisely what number of catchphrases a content ought to contain, nor are there particular figures or measurement you can depend upon that administer how densely watchwords ought to or ought not show up on your site.
There are, in any case, a few contemplations that can assist you with guaranteeing your content is enhanced that can expand the perceivability of your content and improve the general understanding of your crowd.