Ghost button is best used for secondary or tertiary content, since it will not (or should not ) compete with your primary CTA. You ideally want the user to see your main CTA and then (if not relevant) skip over it to the secondary button.
The important bit is this: if you don’t count saturation and brightness, shifting hue towards red (0°), green (120°), or blue (240°) will decrease the luminosity, or perceived lightness of the color. And shifting the hue towards yellow (60°), cyan (180°), or magenta (300°) will increase the perceived lightness of the color.
A narrative does all these things. By forming what you learned into a story, the ideas and insights that come out of discovery are packaged in a way that’s useful and accessible to your creativity. The ideas and insights go from being mere assertions to useful cognitive tools that provoke, inspire, dispute, and rationalize the rest of your design work.