Student or Learner
I have checked On Look Dictionary, and found different meanings for the word color. I could say that the exact meaning of color in here is 'interesting details' as it shown here:But as we noted in 2007, the unnecessary “of” in “not that big of a deal” doesn’t seem to add any particular emphasis or color (though it might add informality).
Grammarphobia: Blog | Grammarphobia
colour noun (INTEREST)