In InDesign, a path is a line or curve that can be used to identify the area where something should happen, such as applying a stroke or fill, typing on a path, something. Paths and frames are very similar, except a path is a bit more versatile. If you string multiple simple paths together, you would have what is called a compound path. Paths have a few properties:
This part's easy. Just create any frame. Done.
The reason this works is that every frame has a path built into it. The default path for every object on the tools palette is the outline of the frame.
Paths consist of anchors (represented by little boxes) and lines connecting the anchors. To modify the path, move the anchors.
Done!
Done!
Refer to the article on skewing frames and paths.