How to Find the Right Opportunities to Submit Short Stories?

How do you find the right opportunities to submit? Do you have a list of things, or is there a place where people can go to find the latest things? I always find it quite confusing. There's so many, there's so many possibilities, it seems hard to weed them out. But once you know the sort of genre that you ride and the kind of markets that are out there, there's always that sort of top echelon of markets for your work.