Here I am again, with another

It appears there is no cropping tool, in Inkscape. So does one accomplish cropping an image using a Mask?
Assuming that's correct, what's the difference between a Clip and a Mask? I should say that I have looked through the various resources listed here. But I'm not quite understanding it. It almost sounds like they are opposites, like one is the other inverted? I'm sure things will become more clear, once I've had some practice at it, but for now, can someone give me just kind of a broad, general description of a Clip, as compared to a Mask?
Much appreciation for your help and patience
