Firstly sorry for my bad English.
I'm translating an article about SMS Marketing. But I don't know what does
Trash everything you think you know mean in the following context?
First time customers who comb through these helpful resources observe a better ROI from their SMS marketing campaigns. Trash everything you think you know about SMS marketing. If you check out these resources in the order that they appear, this immediate and affordable marketing method will soon become second nature.