This set mixes everything from the unit on a new dataset. Harbor Bikes rents classic, electric and cargo bikes from eight stations. rentals has one row per rental: when it started, how long it lasted, where it started and ended, the bike type, whether the rider is a member or a casual rider, the price, and the star rating if the rider left one.
There are no new skills here. Each exercise is a question a manager might ask on a first look at the data. Watch the edge cases: some ratings are missing, and a few rentals ran for hours.