It is pretty simple, RGB is Red Green Blue. If all the values are 0, then it is black, 255 and it is white. You just have the colors and increase them all by the same amount for a lighter color, decrease for a softer color
Hue Saturation Brightness (hsb) is much simpler. Hue works on a scale of 1-360 (I think) with one being red and going through the rainbow until it is red again where the H is the color, S makes it whiter (1 being completely white and 100 being not at all white) and B is basically S but with black.
This is HSB
HSB usually uses a circle and it gets brighter in the center. The more inwards, the lower the S value is. Hue is the diameter of the circle. The B value is on the edge where it is less the farther down you look.