There are page properties for that:
Trip in Florida (page title)
Type:: trip
Year:: 2022
Country:: Florida
Places:: [[City A]], [[City B]], [[Monument C]] ...
This is the best if you want to use queries because pages basically becomes entries of a database.
A query could list for example all the trips to City A in the year 2022.
Using [[Marketing/Psychology]] where it makes sense doesn’t stop you from using it together with [[Psychology]] if something fits both psychology in general and psychology in the context of marketing:
tags:: [[Marketing/Psychology]], [[Psychology]]
Then with queries you can filter pages that contains at least one of the two or both at the same time.
Isn’t this flexibility cool?