Keyword is your goldmine, keyword selection to be exact.
You target the wrong keywords then you make lil to no money. You target the right keywords you make good amount of money.
Whether you're selling your own product, affiliate marketer, etc, as long as you're using SEO as your traffic generation method then you really have to pick your keywords carefully.
You pick the $1,000 keywords or $10,000 keywords?
So, there's something called 'buying...