This template prints a list of pages "under" a certain page in the wiki hierarchy.
Just put the template in your page where you want to print the list of its subpages.
This template by purpose doesn't list subpages with the last part of the pagename being lowercase.
Example: you have
By putting this template in Foo you won't see Foo/Bar/Qas/baz in the list of subpages.This is made so that we can put template pages under relevant pages with a lowercase title and avoid to use the Template namespace instead.