Focus keywords are three or more keywords that match the search intent. For example. My seed keyword is "make money online." I will write" 7 Steps on How to Make Money Online with Affiliate Marketing." My focus keywords will be "make money online" or "make money online with affiliate marketing." In my meta description, I will add the focus keyword, "make money online with affiliate marketing." Which is also in my introduction. That focus keyword will also be my permalink too. BTW, Using Content AI in Rank Math Pro can also help you with that automatically. Just because it says "focus keyword" does not necessarily mean you will rank. Only Google determines that. You can have a tremendous green score, about 93 to 99 percent, but it does not guarantee your article will rank. I want to be clear about that. I use Rank Math Pro myself with Content AI. I hope that clarifies what you need to do.