What categories should we have? or should we not have?

No worries! I also guessed when I recategorized and indirectly confirmed my
understanding by commenting with my reasoning.

Can we make Learn appear first in the dropdown list of categories when creating a topic? (I feel like that will be the topic we want to encourage for most new posters that aren’t familiar with the forum yet or aren’t completely sure what the categories are for.)

good idea! I’ve made the change.

(for future reference: had to check the “categories are orderable” and “that’s true for creation too” boxes, then set an index in each category’s settings.)