I don't think there is any worse sin as a copywriter than assuming that the reader already knows all about the topic at hand. Not telling me how to get the cool

I don't think there is any worse sin as a copywriter than assuming that the reader already knows all about the topic at hand. Not telling me how to get the cool new product you are showing off, what devices it is for, when I can get it, etc., are all leaving out huge details.