Zero Volume Keywords - Do This Correctly

Newbie here and an off-topic question... If I was to get into build niche/affiliate/local business sites, which one of these tools do you recommend - Ahrefs, SEMRush, Surfer SEO, Surge Graph (simple keyword research tool + AI Content writer)?

Can you optimize a single page with so many keywords as a FAQ section? Shouldn't we optimize the page for 2-3 keywords max?

All your videos are awesome new milestone for me. I have a question how can i increase DA

I filled the form. You did not get back to me???

Hi what makes you think most of your visitors will come from Australia and not the US in since you are targeting Australia.

How would posts that include things like photo galleries and short how to guides and recipes perform on a zero volume kw?