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@anthonytaylor1mac-com the way I understand the TAC system, it is teaching you elements of songs, techniques, timing, all different types of things like hammer ons, pull offs, slides, flatpicking, fingerpicking, rhythm, etc.. Many of these techniques many beginners would not even try. By throwing something new at you constantly, it keeps one from stagnating, and just doing the same thing over and over again. Then, when you are learning a song you want to play, you will start seeing the elements you work on in the daily challenges, and for me, it makes learning new songs easier.
Learning actual songs is really up to you though. There are many, many resources for learning songs. I have a number of sites I go to depending on the song.