I have a SN74HC59 (Shift register) but i don't know how to use it, when I search on google I only get vague answers on how it works. ( Yes, I get code wiring etc, etc, but I want to know how it works.)
How much detail do you want to know beyond the fact that you can move 8 bits of serial data into it and get 8 bits of parallel data out of it ?
Does this help https://docs.arduino.cc/tutorials/communication/guide-to-shift-out/
Probably more than you ever wanted to know 
https://www.ti.com/lit/ds/symlink/sn54hc595-sp.pdf
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I too will assume you meant 74hc595.
Here's more than enough to keep you busy. Pinouts, examples &c:
HTH
As @UKHeliBob asks, unless you have extra time and are curious, you might as well think of how several hundred transistors work together to provide the functions of the chip as... magic.
Study the examples for "how to use".
a7
a7
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