SEO is the best and better solution for keyword ranking....

For keyword ranking , firstly you have to do keword planning, measn searchin a keyword whi have less competition through the help of keyword tool.
And they ufcose you have to do SEO

SEO is good for keyword ranking.

Jennifer hope you get the difference between SEO and SMO. So if you want to rank your keyword in search engine, which is very difficult nowadays because of google update, you have to go with SEO.

Your targeted keyword which position in search result, that is call keywords ranking.