Blending mode controls how the layer interacts with other layers. For example, the blending mode "multiply" looks at the color of your layer and multiplies the base color by the blend color. The result is always a darker color. Multiplying with black results in black, multiplying with white leaves the color unchanged.

A drop shadow can give depth to text or elements of an image.

With this adjustment layer, you can adjust the hue (color), saturation, and lightness of a specific range of colors in your image.