Keywords are at the heart of any SEO strategy. They are the thread that links sites to customers via their search terms. Over the years, people have focused and speculated a huge amount about how precisely to use keywords in on-page content to signal relevance to search engines and to rank well.
Historically, people have talked about keywords a lot, often focusing on minute details like “how many angels can dance on the head of a pin”: where to place them in the content, how many words should separate them from the start of a page or heading, the ideal ratio of keywords to other text, and so on.
Some (not very good) SEOs strive to produce content that contains an exact percentage of keywords, often with the result of producing content that isn’t very readable to humans. And some stick to the old tactic of writing as many pages as possible stuffed with keyword variants and synonyms to cover all possible long-tail searches.
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