How can I earn money with hosting affiliate programs?

Hi everyone, well I'm affiliated with Siteground and Hostgator affiliate programs, the question is: How can you promote your hosting services in order to earn money? And also yes, can I put a banner of your services on my blogs so that I can sell your services and earn commissions?

I saw people used ads coupon from hostgator to promot the service,you can act like you are an expert to help people to create resume site and get their ads coupon ?