The challenge

While implementing an SEO project, we always have to perform keyword research and select the appropriate keywords according to the capabilities, resources, and SEO strategy we choose. And determining how difficult a keyword is (Keyword difficulty) is very important. We have researched and analyzed this metric provided by many other parties such as Ahrefs and Semrush. But there is a prominent disadvantage in this regard - they only determine the difficulty of a keyword through the impact of the number of domains pointing to the domain that is ranking for a particular keyword. For some raters, the more referring domains there are on the top-ranking pages, the greater the keyword’s difficulty.

WriterZen's research team doesn't think so. The difficulty of a keyword is not only affected by each link effect (the more referring domains, the better the quality), but it also depends on many other factors. 

https://writerzen.net/blog/what-is-keyword-difficulty-how-is-it-scored
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