That’s easy to understand because of the payouts. If a team is heavily favored, that means they’re perceived as having a better chance of winning. If that’s the case, then you would win less money betting on them. The opposite is true for the underdog: they’re deemed as having a smaller chance of winning, which means you would get a bigger payout if you bet on them (and they won).
A Parlay is a wager which combines several legs in a wager where the winnings from each selection roll onto the next. For a Parlay to be successful, all individual legs in the Parlay need to be winning selections. In the event of a tie in one of your selections in a parlay, the parlay is reduced to the next lowest number of teams. For example, if you have a 4 team parlay and one of the selections is a tie (only on 2 way markets), the leg would be considered a "push". In this instance, the 4 team parlay would then become a 3 team parlay and would be settled at reduced odds to reflect a winning 3 team parlay.
The way the sportsbook does this is by putting out a betting line that is based on how many points they think the better team is going to win by. This is a lot like how our older siblings would "spot us" a few points when we played each other in basketball as kids. For example, let's say that Florida Gators are playing the Arkansas Razorbacks. Let's also say that Florida is the better team and the sportsbook thinks they are going to win the game by seven points. They can't just let everyone bet evenly, or everyone would bet Florida and clean them out. Enter the point spread. The sportsbook would set the point spread on this game at -7 for Florida to win. The negative sign before the number signifies that this team is the favorite to win. This means that if you want to bet on Florida, they have to win by more than 7 points for you to win your bet.
Now Arkansas can lose by up to eight points, and you can still win a bet on Arkansas. As the Arkansas line gets more appealing, more people will start to bet that side. The sportsbook will continue to manipulate the line this way up until game time to try and get the bets as even as possible. While they won't be perfect about it, they can usually get it close enough in most situations. It's also important to note that the line will sometimes shift by half points and it's also capable of shifting back in the other direction if too much money comes in on the other side.
Remember, these calculations are for your profit. Profit is different than the total money returned that you will get from the sportsbook. If you correctly bet the Falcons to win, the sportsbook will return you $340. This will be your $240 in profit as well as your $100 bet that you made. Make sure that you pay attention to this when working with these numbers because we see people get confused all the time as different sportsbooks will give you different numbers.
Because the Blue Jays are favored, the sportsbook needs you to risk more to bet on them. After all, they should win this game. So wagering on baseball favorites with moneylines calls for you to risk a certain number ($185 based on -185) in order to win $100. On the other side, the sportsbook is also willing to reward you for taking the underdog, so they give you an incentive to bet on the Orioles. In this case, you would risk $100 in order to win $165 (+165) on Baltimore.

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.

If the public comes out and bets really hard on one side, the line is going to move a lot making the odds worse on that side and a lot better on the other side. If you’re planning to bet against the public, you should wait to bet until the line moves as far as you think it is going to. Be careful, though, if you wait too long and some big money bettors bet, they can move the line back.

The -110 on either side is like paying a tax or commission to the sportsbook. Bettors would pay 10 percent (aka juice) to the sportsbook, which is essentially a fee for brokering the wager. So, the -110 indicates that a bettor must risk $110 to win $100. Some sportsbooks will even reduce the juice for you which means you can earn the same $100 payout but risk less money to do it.
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