Can someone tell me the colours and their hexadecimals plz..

Question

Confusing

Answer 1

Most used colors are .

black : #000;
White : #fff;
Red : #f00;
Green : #0f0;
Blue : #00f;

You don't need to memorise these codes. Just install a color picker app .

Answer 2

Google can help you here.
There are some great sources to help determine colors