Stroke Color
Stroke Color is used to define the color of the outline. You can select the outline of an object with the selection Tool and choose any color from the stroke color to apply the shade.

Fill Color
You can fill an object with a color from the Fill Color option available in Tool Box. You can fill an object with color. gradient shade or a bit map. To change the shade all you have to do is select the Fill Color with the Selection Tool. Then you have to click on the Fill Color option to get the color palette. From there choose the desired color or the gradient shade to apply it to the object.