Link vs. parent-child?

Hi,
I'm having a little difficulty understanding the difference between a "link" between two notes when using the composition tool and a "parent-child" relationship between notes. How are these two concepts used differently in the tool?

Thanks for any tips or pointers.

A link can include more

A link can include more information than a parent-child relationship. When you create a link, you can assign a link relationship and add a description of the link. For a parent-child relationship, there is nothing else.

so then you have to have

so then you have to have links between notes in the composition module vs. parent child relationships in order for the notes to be compiled. thanks!

If you include a note in the

If you include a note in the outline of a composition project, it will be compiled to generate the final draft.