Where is a good source to learn hex colors?

Question

hex colors

Answer 1

What do you mean by << learn hex colors >>?
(I know what's 'hex colors', but this cannot be learned, just be understood :P)

Answer 2

Check answers in these threads:

https://www.sololearn.com/Discuss/346569/help
https://www.sololearn.com/Discuss/186873/html-colours
https://www.sololearn.com/Discuss/140828/can-somebody-explain-hexadecimal-color-format/