Without a points handicap, it would not make sense to pay both sides of a wager the same amount when it's clear that not all teams are on equal footing. In fact, it is entirely possible for a team to lose the game in real-life but still win a bet if they only lose by less than a set number of points. Vice versa, a team can win a game, but lose the wager if they do not win by more points than what was predicted.
The main goal for each sportsbook is to set the best line possible in order to create even action on both sides of the game. In a perfect world, the book would have 50 percent of the handle come in on the favorite and 50 percent of the action come in on the underdog. If this happens, the sportsbook would be guaranteed a profit because of the 10 percent vig they charge on most point spread wagers. When a book has serious one-sided action, they will attempt to counter that by moving the line in the direction that's taking the most money and try to entice bettors into betting on the other side.

There is no such thing as a half point in sports, but there is in sports betting!  The half point ensures that a side will win and that the match will not end in a push, where the spread equals the actual difference in points between the two teams.  In a push all bettors get their money back, which is no good for the oddsmaker!  Half points also give oddsmakers more control over lines, allowing them to set more specific values.
As you can see, each team is listed, followed by the adjustment or line change for each team, and then the odds that you would be paid out. If you notice, Chelsea has the word scratch next to their name. This is because they are the league favorite to win and all other adjustments are made about them. If your team is in first place at the end of the regular season after the adjustments are made, you will win your bet and be paid the posted odds. As you can see, the odds pay out fairly well on these bets as they are season long and are more difficult to win.

All point spreads are set by the pool administrator. NOTE: The administrator has the power to change the point spreads at any time up until 15 minutes before the start of the first game, so make sure you know when the administrator will make the final changes. For your own information you should also find out where the administrator is getting their point spreads.
Let’s say the sportsbook has a series of bets that are all +250. You think in reality that the bets should actually be +125 and that the bet is not as big of an underdog as the sportsbook thinks. This means that you think you deserve $125 for every $100 bet that wins but the sportsbook is going to pay $250. Even though you think that the bet is still supposed to lose, you should make this bet.
All of this is exactly the same for betting on Southhampton except you use the spreads and odds payouts that are underneath their team. You can also bet on the tie in a lot of sports, especially soccer. In the above example, the spread points would be added to Southhampton for calculations. This means that if you bet +3, you would need Southhampton to lose by exactly three goals.

If you’d prefer to simplify things and only bet on whether a team wins or not, moneyline bets are going to be more of your style. A moneyline bet is a wager on which team wins the game. If the team you bet on wins, you win. If they lose, you lose. As we’ve stated earlier, the sportsbooks must do something to ensure they get as close to an even amount of money on both sides of a bet. With spread bets, they alter the number of points a team must win or lose by.
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.
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