Tray 01 in the Album Settings of the Album Template.
Whatever is here will be in tray 01 for ALL galleries.
When I write something for each specific shoot, don't do it here ...do it over in Lightroom.. Eventually, copy will go here relating to each specific shoot about the purpose of the shoot and my thoughts on the model and how the shoot went.
...or if it's an event or for a band, what that was like.