I've always seen the Basic Wreck course as a way to learn about wreck diving. It covers such things as assessing the wreck from the outside, noting hazards, familiarization of the wreck, planning dives around the wreck, using the wreck to shield from current, etc. I also include things like researching the wreck and its history. A basic wreck course has the ability to be a really good course on how to truly appreciate wrecks when diving them. And there's an optional penetration dive into well lit areas of the wreck. It could be the cavern course of wreck diving with Advanced Wreck as the next level.