In addition to Properties tab #6, "User Fields", tab #4, "Database" is very useful as it is in essence a built-in mini word processor. In it you can type all kinds of virtually unlimited information about a photo, not just the date/time/place. I use it to relate how I happened to be at that place, what I was doing, etc. It is especially helpful for photos on trips, vacations, or any other topic.
One serious drawback to tab #4 is that migrating the info to a new PC, or to a new Operating System, is very problematic at best. Cerious staff has worked with me at length on this problem, but without satisfactory results. I would welcome comments from others with this issue.