In pay per click advertising, negative keywords prevent your advertisements from displaying for particular keywords. Identify the keywords that you don’t want your ads to show up for and add them to your negative keyword list. A well-researched Negative Keyword list will reduce the cost of your ad by filtering out non-converting traffic and irrelevant clicks. It also improves your ROI by reducing the average CPC.
The final and most important metric is conversion. Make sure that you set up your conversion goals within your analytics. That way you can see which keywords are not only driving traffic but out of that traffic what percentage is converting. That is how you can measure keyword success. If you’re not doing this, then it becomes more difficult to identify your highest performing keywords.
When using the Keyword Explorer, Ahrefs will also produce the "parent topic" of the keyword you looked up, as you can see in the screenshot above, underneath the Keyword Difficulty meter. A keyword's parent topic is a broader keyword with higher search volume than your intended keyword, but likely has the same audience and ranking potential -- giving you more a valuable SEO opportunity when optimizing a particular blog post or webpage.