Is there any trick to remember hex codes for colours???

Answer 1

Before memorizing, it is better to understand how it works. In any case, even if you understand how it works to look for a specific color, it can be quite complicated, which is why most people usually use a Color Picker. Most text editors / IDE have some complement for this.
https://www.pluralsight.com/blog/tutorials/understanding-hexadecimal-colors-simple

Answer 2

green
↓
# ff ff ff ←blue
↑
red
0 -> black
f -> white
if rgb repeats eg. #12 12 12 it's more likely to be a shade of grey

Answer 3

a → grey

Answer 4

thanks 😊

Answer 5

From the answer of Sreejith #ffffff in which first ff for red,second ff for green and last ff for blue
And you not to remember all colors hax value only remember which are frequently use in your work..