Had you initially bet $100 on the Mavericks, you would walk away with a profit of $90.91. Now, if you bet on the Mavericks, you will see a profit of only $76.92. On the other side of the bet, an earlier bet on the Magic would have paid you $105. Now that same $100 bet will get you $125 if the Magic win the game. Ideally, this will entice more people to bet on the Magic and the action on the Mavericks to slow down.
As the numbers grow larger each way – the small numbers get smaller or the positive numbers get larger – that indicates that those options are bigger and bigger favorites, or bigger underdogs. That’s particularly relevant when you’re looking at something like the odds to win the Super Bowl. The teams with smaller numbers are deemed as having a better chance of winning and then as the numbers grow larger, those teams are deemed bigger and bigger longshots.
Let’s say that the Mavericks and the Magic are playing in an upcoming game, and both teams are equal counterparts. Let’s say that the odds for that game are as follows. You will never see these odds, though, because in this example, the sportsbook is not set to make any money if they achieve their goal of getting money on both sides of the bet. But we need to look at it for you to better understand things.
Each week you'll submit who you think will cover each football game based on the point spread entered by your pool administrator (see below for an explanation of point spreads). For the last game of the week (usually Monday night) you will specify the total number of points you think will be scored in that game. For each game you choose correctly, you will receive 1 point. The player with the most games chosen correctly will win the pool for that week. If there is a tie, the player that is closest to the actual total points scored in the last game of the week will win the tiebreaker. If there is a tie after that, the winnings will be split up between those players.
Let’s say that people think the Mavericks are going to crush the Magic, and the money starts to pour in on the Mavs. Obviously, the sportsbook likes seeing a lot of bets come in, but they need them to come in evenly. So, to slow down the money coming in on the Mavericks and entice people to bet on the Magic, they will shift both lines. The new line might look something like this:

You can never rule out the weather in sports. If there is a team or contestant who does better in certain conditions but worse in others, you’re going to see a line movement if the conditions change. For example, a football team that has a strong passing attack might become less of a favorite if rain pops up in the forecast. Often, the line does not shift as quickly as it should in response to changing weather conditions, which can create some good opportunities to find value.
Obviously, the first three letters on the top two lines of the three-line package of symbols represents a team in the game you’re wagering on; NYG stands for the New York Giants, while DAL stands for the Dallas Cowboys. The number next to each team’s name is known as the spread or the point spread. Wagers on the point spread are among the most popular sports wagers in the world. The reason this wager is popular is that it doesn’t matter which team wins or loses; what matters is the amount of points the teams score, and whether or not the team you place your money on beats the difference in points (the ‘spread’) or not.
Another form of futures betting involves the over/under on the number of games a particular team will win in the regular season. This type of wager is typically found on pro football and major league baseball, and sometimes on pro basketball. For example, the over/under on the Yankees may be 93 wins. If the Yankees go on to win 94 or more games, the "over" is a winner. If they win 92 or fewer games, the "under" is a winner. If they win exactly 93, the bet is a push and tickets are refunded.

There are four elements to the moneyline bet that you can see here. The first column is just an identifier of which bet is which for the sportsbook. When you place your bets, you can tell the sportsbook you want to bet on the Eagles to win or that you want to take bet 055. This number has nothing to do with the actual game and is just a code for the sportsbook to keep their bets organized.

Betting “against the spread” (ATS) just means you’re betting on the point spread in a particular matchup as opposed to the moneyline, or some other type of wager. Bettors often use a team’s ATS record to gauge its performance against the spread. For example, the New England Patriots were 11-5 ATS in the 2017 regular season, meaning they covered the posted point spread 11 times, and failed to cover five times.