The problem is that I found many ways to classify idioms according to different types (e.g. opaque and transparent or decomposable and non-decomposable or high and low frequency). These mentioned videos will be used in my research to measure the effect of humorous videos on English idiom learning and I will not use all of them which means that I will choose some of them but I do not know how and what should I . choose. In other words, depending on what should I classify these idioms?