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In summary, be aware that keyword placement is more important than density or frequency. Put them in the meta title and meta description, use them in the URL and last but not least, of course, in the body of the text. They should also appear in the title and in some subtitles. It is important to use them in image file names and alternative text.

As you can see, the question is not how many keywords to use for SEO, but how to use them effectively.