Best of
Hand-picked groupings with a note on every entry saying why it made the list.
Ideas where the first payment can land within days, using things you already own or can borrow. None of these become a business by Monday; all of them put cash in your hand.
Nothing to buy before the first sale. The cost is your time, a skill you already have, or something you already own. If an idea here asks you to pay for a course first, that's a different idea, and probably a worse one.
Ideas with a realistic ceiling at or above a normal salary, run by ordinary people in ordinary towns. Every one takes months to get there and most people quit before it does. The difference between these and the graveyard is that when they do work, it's because of the work.
The graveyard. Each of these gets pitched to thousands of people a day, usually by someone who makes their money selling the pitch. We rate them on the same scales as everything else and then explain where the money actually goes.