The color wheel is the basic tool for combining colors.
Primary Colors: Red, Yellow and Blue. All other colors are derived from these hues.
Secondary Colors: Green, Orange, and Purple. These are the colors formed by mixing the primary colors
Tertiary Colors: Yellow-orange, red-orange, red-purple, blue-purple, blue-green and yellow-green. These are the colors formed by mixing a primary and a secondary color.
Cool colors: Colors such as blue, green and light purple have the ability to calm and soothe. Cool colors remind us of water and sky. Cool colors look as though they move away, making them great for small rooms you want to look and feel larger. If you have tiny bedroom or powder room that you want to visually enlarge try painting a color such as light blue to make it look more spacious.
Warm colors: Colors such as orange, red, yellow tend to make you think of sunlight and heat. Warm colors look as though they come closer, which is why they're often used to make large rooms look cozier. If you have a huge bedroom that you want to look more intimate try painting a warm color such as terra cotta or brown to make it feel cozier.
Neutral Colors: Neutral usually means without color. Soft hues, such as beige, khaki, and rain-cloud gray, create a calming atmosphere, while the contrast of a black-and-white color scheme introduces drama and flair.
If a color is made lighter by adding white, the result is called a tint
If a color is made darker by adding black, the result is called a shade
If gray is added to a color the result is a different tone