Some people really want to learn “the right way” or in “the right order”. While there’s no such thing in a language such as music, these lessons are put in an order where the later ones will make more sense if you already understand the previous ones. Think of these lessons as introductions to concepts that you could dive into more deeply - they are short enough that you won’t get bogged down on a boring topic you already understand, but extensive enough that you’ll get a taste for all the biggest concepts on your instrument.