A: Use a mnemonic: 255 is FIRE (max). Remember the secondary colors:
A: Yes. Most "Exploring RGB" modules lead into Hexadecimal. Remember that hex is just RGB base-16. #FF0000 = rgb(255,0,0) . Learn the pairs: FF=255, CC=204, 99=153, 66=102.
The challenge on CodeHS introduces the RGB encoding scheme , a method of defining colors numerically by mixing red, green, and blue light. Key Concepts from CodeHS Lessons