Upload & Sell: Off
This is what I do and it might give you an idea how to make use of the C 1-3 settings.
C1. portrait & general, Av mode, f/2, silent shutter, oneshot
C2. sports & action, Tv mode, 1/500, high speed, AI servo, Case 1
C3. manual & video, M mode, 1/50th, f/2.8, silent shutter, oneshot, neutral 0, -4, -2, 0, 1080 24p