A friend told me that the density of keywords in the pages of the site must be between 4% and 6%. But if it ever exceeds 6% (for example you can find a keyword more than 10% in a page of the site) it would have a negative impact on the referral site. What do you think?
Can you explain more about your answer, if you have read something about this so that I also agree with you
Chasing after optimal keyword densities these days is as the original poster said, "insane". Their is no optimal density. And keyword density of the content on a page is a very minor ranking factors these days. Just pick a topic and write your content for users... Make it sound natural. Pretend you are explaining the topic to a friend or relative... The keywords will come out in the content. IMO a keyword density of 4-6% is too high. It will not read naturally. That means you're repeating the same word every 15-25 words. It's going to read like spam. While it might possibly help your page rank a tiny bit better (or make no difference at all), once a user gets to that page they are going to hit the backbutton if the same word appears every 15-25 words. But if you need a target, IMO content written for users instead of SEO tend to have a natural keyword density of around 1-2%. PS: The places that keyword density REALLY matters and can have noticable affects on rankings is the keyword density within individual HTML elements which are themselves ranking factors: <title>, <h1>, <h2>s, link text for inbound links, etc. In these cases, because the content contained within each element is so short, the affects of keyword densities gets magnified and can make noticable differences in rankings.
Keyword density is an old story now and you should focus on writing quality content with natural tone, not with keyword density in your mind. As long as you keep your content for your visitors, it will never bother search engines to ban your website. In short, don't focus on keyword density, focus on quality website content. Regards,