Basically, you can change your Mac's appearance from inside Apple ▸ System Preferences ▸ Appearance. Inside this pane, you can change your Mac color appearance, window behavior, recent items or even font smoothing.
Let's see what you can do with it.
Mac Benefit 1: You don't need to click Apply like Windows. The changes will be applied instantly.
Inside this pane, you will see that you have the default value for Appearance: Blue and Highlight Color: Blue.