Hi @wilkinshui
Thanks for the compliment.
Basically, you get visitors to your sale page with the help of S.E.O and it increases the chances of sales but you have to be expert and honest in order to earn from selling stuff. If you have marketing skills + S.E.O and looking to sell something genuine, then you can make load of money with that.
Sure, I'll be posting more tutorials in detail. Follow me for updates! :)