How to Read HEX
The first two digits represent the RED value.
The middle two digits represent the GREEN value.
The final two digits represent the BLUE value.
Each digit represents a number between 0 and 16, where 10 = A, 11 = B, 12 = C, and so on up to 16 = F.
The pairs translate to the amount that each color is present with 00 being not at all and FF being the most of that colour you can have.
An overlap between RED and GREEN makes a YELLOW.
An overlap between GREEN and BLUE makes a CYAN.
An overlap between BLUE and RED makes a MAGENTA.