While gambling is legal under U.S. federal law, there are significant restrictions pertaining to interstate and online gambling, as each state is free to regulate or prohibit the practice within its borders.

Hedging bets is by far the most successful betting strategy. This is where you're able to place multiple bets to cover all possible results and still make a profit regardless of the outcome of the game.

One bettor won more than a half-million dollars by hitting an insane parlay during Championship Sunday in the NFL. The lucky winner turned their $20 site credit on FanDuel into $579,000 by correctly guessing the winners and exact score of both conference championship games. There's 55 555. There's just 55 555.