The odds will change based on betting action. In major sports leagues, where teams are more evenly matched, lines of less than three points are frequent. In sports such as college football or college basketball, where non-conference matchups can pit small schools against national powers, it's not uncommon to see a point spread of more than 30 points. For example, FanDuel Maryland may have different odds than others. The online sports betting odds, often referred to as the Vegas lines, will vary from sport to sport and depending upon wager types.
In the case of the favored Capitals, the minus sign shows how much would be garnered via a $100 wager on Washington. Wager $100 on the Canadiens with a brand such as Caesars Maryland, and you'll win $175. In the case of moneyline odds, if the Washington Capitals are listed as -175 against the Montreal Canadiens at +225, this means that Montreal is the underdog. American odds are based on hypothetical $100 wagers.