Where the advertisement should be placed? In which style, form and size should it be? In which part of the advertisement the video clip should be placed? How many days should the banner is placed? You face thousands of questions. The most important part is who will see it. It is difficult enough to advertise jaws in a kid magazine. On the other hand to advertise a tooth paste for kids in the magazines, which are read by grandmothers, is quite promising. It the science does make laugh at Hellap, whom should we trust? We assume, you should trust those who know about the requirements of readers and audience. Practice is a great thing, because it cannot be sold.