Hello Stasia,
My first rule is to use as few patches as possible, because each patch adds a layer to the character timeline.
This will be dependent on the design.
If we take the blue cartoony cat in
the article as an example, the hip joint could be treated without the need of a patch.
The next decision to be made is where to put the patches. Whether to have them as frames inside the body part symbol, or as a separate symbol. Both approaches are valid.
For most people it seems more intuitive to have a separate patch symbol, with corresponding frame numbers.
Say if you have a foreshortened version of the arm on frame 5 of the arm symbol, you will have its matching patch on frame 5 of the patch symbol.
The simplest starting point for a patch is to repeat the fill shape (copy/paste) of the underlying element. Then no wrinkle will appear at all. (See the foot of the cat.)
You can also start with a simple rectangle, hard-weld it and start rounding one of the vertices, and test.
After a while you will get a good sense how shapes interact, but you can use the examples in the article as a starting point.
Of course, you can have variations of the patches inside the patch container for different situations.
Hope this helps!