15 How do I know when I’m using the right number of keywords on a web page?
Ans. Unfortunately, there is no “right” number when it comes to keywords on a web page. TF IDF is a good option (read more). Essentially you look at the words that competitors use and their density and take the position that if Google has ranked them, they must be in the right ballpark for keyword density. If you don’t use these words then you might not rank. If you include too many, then you might be penalized with keyword stuffing
