A lot of the casts are adaptations of 2 handed casting on a single hand rod or perhaps it is the other way around. The purpose of many of those casts is to aerialize (new word) the line to eliminate drag from the water. Some are the opposite and made to position the line to achieve stick from the water to load the rod. Many are good to use when there is a shortage of room for a back cast. Some are for show or at least it appears that way to me. All will get a hook in you if you are not careful.