Street Fighter 5 has a free-to-play style system in place where once players have purchased the game initially, every update to the game and almost every piece of downloadable content will be free after the fact that goes for the likes of characters, stages, and some (but annoyingly, not all) costumes.
The point is this: Fight Money is how you unlock new characters, stages, costumes and alternate colours and stage layouts in Street Fighter 5. It's that or real money, and who wants to spend if they can avoid it?
The catch with Fight Money is that it's actually quite hard to come by. This guide page exists to help you out if you're trying to figure out what the best way to earn or grind Fight Money is this'll help you to fill your account, and once you do, you can go on a DLC spending spree!
Here's how to best earn Fight Money: