I would like to know the difference between the banner groups:
BannersAll
Wide-Banners

the sidebox-banners are only displayed on the sidebox, I get that! :)

The other banners... where are those placed? what are their sizes? And how does the groups work?
I noticed in the images/banners directory a square banner 125x125 that says "our favorite feature product". So I get that I need to save the image to that directory, and create this banner under what group???

Couldn't find any info in the wiki.

TIA

Laney