Categories describe the book type
Categories like Fiction, Self Help, Productivity, Psychology, Business, and Personal Finance describe the broad shelf a book belongs to.
Collections describe reader intent
Collections like World Classics, Indian Authors, and Peacock Classics are curated groups. They can overlap with categories but are more useful for browsing.
Search still matters
If you know the exact book, search by title. If you are exploring, use categories and collections to narrow the shelf before comparing stores.