I also learned folk guitar in this summer vacation. I learned ten lessons. Teachers first teach right-hand exercises, then left-hand exercises, that is, semitone exercises, and then let us practice some scales to familiarize ourselves with the position of each tone. Finally, the most difficult chords are taught. After all the chords are familiar with, you can practice some simple singing. Teachers also play some tunes in each class to activate the atmosphere. Every class will also let us return what we taught in the last class. Anyway, all teachers should teach this way.