Heroes 5.5 WarGame Edition - Tactical Edition.

Generally, yes, the previous speaker seems to have explained everything clearly. Although 5 groups might be a bit too many, it's still acceptable, I suppose.

From the beginning of the aura or aura/area-of-effect

Red.

then activated abilities

Yellow/orange

then immunities

Green.

static/effect/random

I don't know.

class-based/standard

Default.
The principle is simply like a traffic light for the first three groups. And my associations with the colors are exactly like that. The aura is associated with fire, so it's red. Activated abilities are associated with yellow because of the yellow highlight of units when you hover over them. Immunities are always positive abilities, so they are green.
It should also be clear about class-based abilities.
Static/effect/random is difficult. Maybe purple? It will stand out against the other colors, which will emphasize the specificity of these features.