This following example is from the "The Most Complete Starter Kit Uno R3" from Elegoo. I've arrived at the lesson about the 4x 7 segment display, controlled via a 74HC595, and in the tutorial it gives almost no information as to how it works or what it is supposed to do - I had to piece this togeth…

Please help me understand this 4x7 Segment example (it doesn't work)

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