how do I Check what color a block is?

Try to use a local variable like this

local part = script.parent.brickcolor

print(Part)

if part.brickcolor = "Green" then:connect(function()

idk if the function bit works but the rest does

Try checking the brick color as in your setting a brick color in code

if part.BrickColor == BrickColor.new('Black') then
    print('its black!')
end

I think you should use this simple method to know if it is red or green.

 if part.BrickColor == BrickColor.new('Lime green') then
    print('Its green!')
end

Try this

local part = game.Workspace:FindFirstChild("Part")

if part then
    print(part.BrickColor)
end