Although all classes are different the main structure all classes follow is that they explain how to create tracks, and sounds from scratch. They also show how one or more tracks from the past were created going though all the elements of the track which are usually sound design, mixing, mastering, all the plugins they use, arrangement, melodies, and often some music industry insights like how to create your own unique sound or how to get noticed by other DJ/Producers / record labels / booking agencies.