What justified Jason selecting some keywords and not others? Is there a specific number of keywords a niche should have to qualify being selected?

What justified Jason selecting some keywords and not others? Is there a specific number of keywords a niche should have to qualify being selected?

Jason suggests not going after niches where there's only 1 keyword. We want at least half a dozen or a dozen. We should use the formula showed in the training to estimate how much money I'll make as an affiliate from the site. That heavily influences the decision.