How does Hexadecimal work with colors?

Question

What does hexadecimal mean and how can I tell a color by seeing its hexadecimal code without memorizing it?
Does it have any relationships with RGB and CMYK system?

Answer 1

The first 2 digits of a hex code represents the red, the middle 2 digits represents green and the last 2 digits represents the blue, the scale starts in 0 to F (0-9,A-F) but see this to understand better:
https://www.sololearn.com/Discuss/2306823/does-anyone-have-a-good-understanding-of-hex-codes