I gotta say, I'm continually confused as to why TOS had the pilot and navigator also firing weapons. Why didn't they have a tactical officer?
Because they didn't have the budget for it. Although I suppose they could've made one person both helm and navigation and another one security/tactical. But maybe it didn't occur to them because they wanted to portray Starfleet as an exploration service rather than a combat-oriented one. Or maybe just because they expected the captain to take the lead in the fights.
The primary colors are red, yellow, and blue. Maybe you intended to say that.
No, that's a myth that gets perpetuated in grade school for some reason. The reason there even
are three primary colors is because our eyes have three color-sensitive pigments that react to different wavelengths of light -- one is most sensitive to red, one to green, one to blue. Therefore, all colors that the human eye can perceive can be created by mixing red, green, and blue light in different ratios. All three in equal quantities give you white light. TV screens and video monitors have arrays of red, green, and blue phosphors or LCDs that are used in combination to create colors. If you have a photo editing or graphics program on your computer, look at its hue settings, and you'll see that the sliders are for adjusting the levels of red, green, and blue.
Now, those are the additive primary colors, the primaries for things that emit light. There are also subtractive primary colors, which are the complements of the additive ones -- cyan (white - red = blue + green), magenta (white - green = red + blue), and yellow (white -blue = red + green). These are the primary colors used in printing, since inks and dyes absorb light; combine all three equally and you get black. Look closely at an old comic book or color newspaper photo and you'll see it's made up of cyan, magenta, and yellow dots (and black for a 4-color process). Most color film processes also use cyan, magenta, and yellow. I think maybe the myth that the primary colors are red, yellow, and blue is based on mistaking magenta for red and cyan for blue. Although it's probably just from taking every alternate color of the rainbow (ignoring indigo).
https://en.wikipedia.org/wiki/Primary_color
Gold is a yellow, and for our purposes, it can be equated.
Gold is gold. It's more of a yellowish brown than pure yellow. In HTML colors, gold is RGB(255, 215, 0) -- red at 100% and green at 84% of maximum. Pure yellow is (255, 255, 0), equal amounts of red and green.