if I wanted to teach my five year old granddaughter how to make a quilt, and took pictures, say, 12 or more...would it go in main quilting section, or Picture section,...and...is this of interest to many, or should it go in my diary
First of all, nothing related to quilting should go into PDA or GCC. This is a quilting message board, so stuff related to quilting is "interesting" by definition. Even though realistically not all of it is interesting to everybody. But quilting is what this board is about. So the Main and Pictures sections are for topics about quilting, no need to worry about them being too private.
As for what should go into Pictures vs Main when pics are included, that's a tough one. I guess you can go by intent. If it's a "show and tell" sort of thing, then post in Pictures. If you are including pics just to illustrate your question, then I guess Main is the right section.
Let's not digress further. We can get back to this discussion later.