A lot of betting strategy is very complex, and it definitely helps to learn some of the more advanced concepts if you want to be truly successful. However, trying to get your head around complicated strategies is NOT the right approach as a beginner. There are several simple betting systems that are relatively easy to understand, and it makes much more sense to start with these. They're not guaranteed to bring immediate success, but they can be effective if used correctly.
If you've never set foot in an actual sportsbook before or logged into an online sportsbook, the chances of you getting overwhelmed when you actually do is very high. In an actual Las Vegas sportsbook, there is typically a lot of commotion and the odds and lines are displayed on a massive digital board for everyone to see. When a novice sports bettor looks at the massive digital signage, they will see a bunch of numbers, both positive and negative, some two digits, some three digits. They also won't have a clue what any of it means. The same can be said for the online sportsbooks. It looks like a massive spreadsheet with negative and positive numbers beside each teams' name.
The divisional round of the NFL playoffs concludes on Sunday, and we’ll know which four teams have a chance to win Super Bowl LIII after two must-watch games. Tom Brady and the Patriots will try to earn their fourth consecutive AFC Championship berth, but is it finally Philip Rivers’ year? In the NFC, Nick Foles led the Eagles to a stunning upset of the Bears, but can the defending Super Bowl champions take down the No. 1 Saints?
Using sports betting sites to bet on football online is relatively straightforward. It's super easy to open accounts at most sites, and the majority of them are very user-friendly. Finding and placing wagers generally takes no time at all, and can be done from the comfort of your own home with just a computer and internet access. You can even use most sites from a smartphone or tablet these days.
If you're seeing 15 or 25 instead of 15/1 or 25/1, you're seeing a decimal form of odds, as opposed to fractional. Multiplying your stake by decimal odds gives your total return, not your profit(which is total return -stake). To get to fractional from decimal, add 1. So 3/1 fractional = 4 decimal (just 4). 4/6 frac = (4/6+1) dec = 10/6 = 5/3, or 1.666, which is rounded to 1.67 by bookies. To go from decimal to fractional, subtract 1(which makes sense from profit = total return - stake) So 15 dec = 14/1 frac. 2.33... dec = 1.33/1, or 133/100.

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Sports spread betting began in the United Kingdom in the late 1980s to offer an alternative form of sports wagering to traditional fixed odds, or fixed-risk, betting. With fixed odds betting, a gambler places a fixed-risk stake on stated fractional or decimal odds on the outcome of a sporting event that would give a known return for that outcome occurring or a known loss if that outcome doesn’t occur (the initial stake). With sports spread betting, gamblers are instead betting on whether a specified outcome in a sports event will end up being above or below a ‘spread’ offered by a sports spread betting firm, with profits or losses determined by how much above or below the spread the final outcome finishes at.

The concept of betting on totals, or Over/Under (O/U), is quite simplistic. The bettor wagers on whether the TOTAL points scored in a game will fall over or under a pre-determined number set by the sportsbook. Much like the point spread, game totals can be swayed by public opinion. The example below, from the SI Archive, shows the opening totals line for Superbowl XLV:
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.
A listed odd with a + sign in front of it, such as the +120 in our example above, shows us how much money you would win on a $100 bet. Using the +120 odds, it shows us that a $100 bet on that outcome would pay out $120 in profits. Again this can easily be converted into smaller or larger size bets. A $10 bet on +120 odds would pay out $12 in profits.

For those that live outside the United States, this may look even more strange since -110 is in American odds format. In Decimal odds, which is common in Europe, -110 translates to 1.91 odds. I'm not going to dive into Decimal odds (or other formats) since this article is about American odds, but the Decimal system is pretty straightforward. The odds listed represent a bettor's total return for a winning wager as you simply multiply the odds by the amount you wish to risk. If someone risks $100 at 1.91 odds and win, they receive $91 plus their initial $100 risked ($91 + $100 = $191).

To achieve this balance, the book can move the spread and/or the juice at any time after the first lines hit the NFL odds board, all the way up until kick-off. If there had been too much action on the Packers at Super Bowl 1, the oddsmakers could have made Kansas City a 15-point underdog (+15), in order to encourage more people to bet on the Chiefs. They also could have kept the spread at 14 points and moved the juice, perhaps to –105 for Kansas City and -115 for Green Bay. You’ll often see the books adjust the juice first when the spread is three points; since so many NFL games end in a winning margin of three points (roughly one in six games), moving the spread from 3 to 3.5 points is a pretty big deal, and it might tilt the balance too far in the other direction.
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However, there are some good values with teaser bets if you know how and where to find them. For instance, the six-point teaser is an especially effective bet in the NFL, where most games are tightly contested and six points can make a world of difference. For instance, in our previous example, the Bears would go from laying six points to simply needing to win if you put them on a teaser bet. Conversely, Detroit backers could get 12 points instead of the starting six. (Source: Doc's Sports Service)
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