Subpages on SL are a mechanism of grouping pages about the same thing together. If you have a page, say Somepage, then it may have subpages.
- Somepage/Discussion - for discussions about the content of Somepage
- Somepage/Solution - for the solution to a problem posted on Somepage
- Somepage/Attempt# - for someone's attempt at solving a problem on Somepage (the # can be left out, or any number, or someone's name even - the standards are unclear)
- Somepage/Errata - for corrections and mistakes (the errata) of a book or website described on Somepage.
Actually, one can make a subpage with almost any name one wishes - the above are just some of the most common ones.
When should a page be a subpage?
From KGS Clans:
It might make more sense to have these pages as subpages of the main page.
Steve: I disagree - this makes about as much sense as having all KGS User Homepages being subpages of the KGS page. The flat structure of links in SL makes cross-linking easier, and stuff easier to find - subpages should generally be used only for pages which will generally not be worth reading outside the context of the parent page.
Forums in subpages
A page and its subpages share a common forum.