Sure. How much time you got?
Stick with me, kid, and you will be.
An object can be of any shape. It can be manipulated independently of other objects, backgrounds, etc., even without going to multiple layers.
To make an object, mask off the desired area using whatever mask tooks are appropriate to the particular graphic. “Mask->Paint on mask” can be used to tweak a magic wand selection. Once your selection has been made, Object->create from mask is the option to use (this may be on diff menus depending on version). Once you have an object, it can be selected (click on it), rotated, stretched, copied, and otherwise manipulated independently of the rest of the graphic.
I’m not sure this works for all versions, but a single click selects, a second click on the same object allows for rotate and single-dimension skew functions, a third click shows 2-dimension skew/distort functions, a fourth click, back to simple selection. (These clicks are not time-dependent like Windows double-clicks, but state-dependent.)
If the object appears to be “negative,” or not what you expected, try mask->invert before creating it. I often find it difficult to tell which section of the image is IN the mask and which is OUT of it.
Anti-Aliasing: Have you ever seen the “stair-steps” on the edge of graphics, especially slanted lines or curves when blown up? These are digital artifacts, and can be eliminated by increasing the resolution to reduce the size of the steps. But if that is not an option, there is an optical trick that can produce an apparently smoother line from a jagged one. Anti-aliasing functions will blend the stairsteps into the background by blurring the edges, and the eye is often fooled. There is considerable art to this process, so I can’t begin to show the total range of options in the time we have left. I suggest experimenting with anti-aliasing on/off controls when they appear, and trying various settings until you get the hang of it. Just remember, it doesn’t work for all cases all the time.