basically he said that no colors can end with the o ending lol not much explanation so whatever I wont ever enda color with o
Mocha, it's the NOUNS that have neutral endings:
Biuro - Office
Kino - Cinema
Piwo - Beer
Spotkanie - Appointment/Meeting
This is where your 'o' and 'e' come from.
Colours are ADJECTIVES, words used to describe the nouns, and these end in 'y' or 'i' for masc adjectives, 'a' for feminine, and 'e' for neutral.
So for example: ( Neutral )
Zielone Biuro - Green Office
Czarne Kino - Black Cinema
Małe Piwo - Small Beer
Duże Spotkanie - Big Meeting
Biała Kawa - White Coffee
Mała Szkoła - Small School
Dobra Restauracja - Good Restaurant
Tani Pub - Cheap Pub
Mały Parasol - Small Umbrella
Czarny Długopis - Black Pen
You'll find that later on when you learn more, the endings of words will change, but I hope these examples will help.