Do you find there's so much on Ancestry you find it difficult to isolate a particular database you need to search? I do.
Ancestry Weekly Journal has a useful article this week by regular contributor Michael John Neill on finding specific databases in Ancestry using the card catalog.
The article covers the Filter by Collection and Filter by Location features as well as warning of a pitfall. He also mentions filter by date and language.
I had difficulty finding the starting page he refers to .. it's copied here. You may want to bookmark it separately.