A push in sports betting is when the bet lands on the exact number offered by the sportsbook, and your bet gets refunded. Say you've bet on the Chiefs as 10-point favorites over the Chargers, and K.C. wins by exactly 10 points. Whatever amount you bet is returned to you in full.

Every sportsbook will cancel your bet if the player is inactive per the league or team's official injury report. That's the case if you bet the over or under. Some books will honor the bet if the player is active, even if he or she doesn't play a single second.

The best sports betting market is Match Outcome because it is more common and easy to research on. However, you can also consider Outrights in horse racing since they have competitive odds.

To summarize, short selling is the act of betting against a stock by selling borrowed shares and then repurchasing them at a lower cost and returning them later. It's a relatively sophisticated (and risky) trading maneuver that requires a margin account and a keen understanding of the stock market.