For me two’s complement started making sense when I realized that for example when you subtract 1 from 0, regardless of using signed or unsigned, you get 111111

For me two’s complement started making sense when I realized that for example when you subtract 1 from 0, regardless of using signed or unsigned, you get 11111111 (assuming 8 bits). Using two’s complement, we just interpret it as -1, but the binary arithmetic is the same.