Bardic Lore
Treat the areas of your lore like books. Is the upwards-flowing waterfall you just came across something important that would be covered in a book or college course called “On Spells and Magicks?” If so, your Bardic Lore of that name applies.
If you care enough to ask a question about it then it’s probably important. Don’t second guess yourself: if you care enough to want to know more about it then it has some importance.