If your search is related to the anime (the Light Music Club), "lessons" usually refer to learning the songs or downloading sheet music and guitar tabs to play like the characters. Free K-on sheet music | Anime hub - MuseScore.com
While streaming is popular, downloading offers the freedom to watch those after-school practice sessions offline, without buffering, and with the original high-fidelity audio. kon lesson download
There are several resources available online where you can find Kon lessons: If your search is related to the anime