Before I go on, let me clarify some terminology. Despite it being probably the most popular way to bet, there is no particular term for a bet against the spread. Many people call this a "straight bet." However, this term can also be used, and is printed on tickets for, money line bets, total bets, and any other bet involving just one game. For purposes of this page, I call such bets a "point spread" bet, and invite the rest of the world to adopt this terminology.
When the point spread was invented in Chicago by Charles McNeil the money line took a backseat. When two unevenly matched teams played, the playing field was leveled by having the favorite give points (for example Chicago Bears –7) while the underdog got points (Minnesota Vikings +7). No matter which team the bettor took the bettor would always risk $110 to win $100. The extra $10 needed to win $100 is called the juice or the vig, it is basically the house’s or the bookie’s take. It’s 10-percent of the bet so it would take $33 to return $30 and $440 to return $400 etc. (winning bettors get the vig back). 

Point Spread – This is the margin of victory for a game determined by the oddsmaker. Sportsbooks use this to create action on both teams. The favorite will have to win by more than the margin the oddsmakers set. If the Broncos are favored by 2.5 against the 49ers, they must win by 3 points or more for a win. If they only win by 2, they didn’t cover the spread and those who bet the 49ers will win.

Round robin betting is a creative type of parlay betting that requires making multiple parlay bets at once. Deriving its name from round robin tournaments—where each team in the tournament plays against each other at least once—this type of betting is when you have a number of betting lines (moneyline bets, spread bets, totals bet, etc.) you want to parlay.

For example: If it is universally believed that Alaska State is better than Hawaii Tech, a standard win/loss wager wouldn't work, since most likely people would bet more money on Alaska State. Therefore, the Sports Book could put the point spread on Alaska State at 6.5 points. This would mean if you bet on Alaska State, not only would they have to win the game, they'd have to win by at least 7 points to make you a winner, otherwise a ticket on Hawaii Tech, even though the team might have loss, would be a winner.
Absolutely. When the lines go up for the NFL, or for the first game of the NCAA men’s basketball tournament, there are several days in between the open and the game itself where movement can take place. You’ll find that the betting public tends to pile in on their favorite teams once they get home from work on Friday. You can anticipate these line movements and time your bet accordingly to take advantage.
The team is now 6-1 since rookie Lamar Jackson, the former Heisman winner, took over as the starting quarterback. Jackson is only the fifth rookie quarterback in the Super Bowl era to win six of his team’s final seven games. Baltimore won at the Chargers in Week 16, 22-10. The Ravens defence completely dominated, holding L.A. to just 198 yards and forcing three turnovers. Our complete preview of this game can be read here.
The negative (-) sign indicates that the Cowboys are the favorites, while the positive (+) sign indicates that the New York Giants are the underdogs. With the spread set at 2.5 points, a bet on the Cowboys would mean that they would have to win by more than 2.5 points (3 or more) in order for you to win that bet. A bet on New York would mean that the Giants would have to either lose by 2.5 or less points (2 or less) or win the game outright in order for your bet to win.

For reading the fraction odds, I strongly recommend converting them to a decimal. This will make figuring out your potential win much much easier! To do this, just like in 2nd grade, you take the first number and divide it by the second. So if your odds read 7/4, you simply divide (7) by (4), which equals 1.75. That is the decimal form odds, now you simply multiply (1.75) by whatever your wager amount is to figure out your potential profit. In this case, if you were to risk $100, then your potential win would be $175 profit if you are correct! Also, you will receive your initial bet amount of $100 as well, for a total of $275 in your hand.
With some betting sites odds, certain games are priced differently than risking $1.10 to win $1.00 (which is called -110 odds). For example, you might see the Giants priced at -105 and +7 in a game against the Jets. Now, you only have to risk $1.05 to win $1.00. This is obviously better odds, but it's very likely that they will lose by exactly seven to give you a push. Taking -110 and +7.5 with an alternative bookmaker is actually the better bet.
If you bet on sporting events, you must be able to read odds and understand what they mean. Furthermore, you need to quickly calculate the potential winnings for different bets, especially if the odds are changing while the event unfolds. Odds tell you the likelihood that an event will occur (a team wins, a boxer makes it a certain round) and how much will be paid out if you win. There are, however, multiple ways to convey this information.
As always, beware of sites offering paid or free NFL betting picks in connection with a varying unit betting system. If you are using their pro football betting picks to gamble on NFL football games, you might consider that some of these sites are providing money tips which are likely to drain your NFL sportsbook account. Earning gambling profits long term takes discipline to know there is always another game to bet on. Most free sports pick sites don't understand that it requires more than winning football predictions to earn a living betting on sports. So for anyone living in an area where NFL gambling is legal, keep in mind that relying on "bet the house" free NFL picks could seriously reduce your NFL betting success.