Music theory, particularly as this applies to piano and guitar; vocabulary enrichment, if that’s even a thing; creative writing; how to be a better conversationalist; astronomy; political science; gardening; woodworking and carpentry; cooking and meal planning; first aid; developing a decent golf swing; how to avoid or at least keep diabetes at bay; and how to make a good coffee/espresso drink.
Guess I better pick two or three and get busy.
3 Cents' 
It’s amazing how many things we want to learn once we really stop to think about it😄
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