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TAC is the best guitar learning platform, bar none! I firmly believe that it stands alone in it’s design to draw you in daily and provide fun lessons for players and many different levels. That isn’t an easy thing, no 2 players are identical in skill level and in what they find interesting. It would not be hard to be boring for some, but even very good players say they get something out of the challenges.
That said, there is always room for improvement and many active members and newcomers come here with good intentions and offer suggestions. Accessing past challenges is something that comes up very regularly. It’s interesting that Tony & the course designers gave us direct access to lessons going back 6 weeks and deemed that sufficient. There are are requests and questions that are also repeated with regularity.
It would be over the top if TAC had a Knowledgebase. If you don’t know what that is here is an example. They are almost always behind a paywall but sometimes you can get a glimpse of what it looks like. It’s essentially a database of Knowledge. You can see the structure here but in order to get to the articles you have to have valid login credentials:
https://userapps.support.sap.com/sap/support/knowledge/en/1868899