The Most important for SEO is that first is find keyword at SERP for google at top.After that get traffic and conversion rate.Its depends on how much visitor convert in customer so its conversion.All three are important one after that Ranking, Traffic, Conversion Rate.
Ranking is most important because it is root of other two.If we get good ranking automatically ,traffic & conversion also.
I Think The Ranking Most Important Thing coz If You site Page rank Is Good then google will Send Live Traffic To you Website
Those things are SEO products, not SEO preconditions, but OK. You cannot take them independently - with better ranking you get more traffic and usually better conversions. I would say that ranking is what SEO targets before all.
Ranking is very important bcos it show position on google or value of your website page on search engine.
Ranking and traffic are most important..... If you focus on Ranking then traffic will increase and traffic increase your Income of ads................