We are putting together a series of blog articles explaining the odds.
To give a quick example, for Hockey, tonight Vancouver plays Montreal. There is the Money line (meaning picking a straight winner) VAN -180 & MONTREAL +150.
-180 means you need to wager 18 dollars to win 10. +150 means if you wager 10 $ you win 15$ (always plus your initial wager).

The puck line for the game is VAN -1.5 +220. This means you are betting that Vancouver will win by 2 goals (the -1.5) and if they do, a bet of 10$ would win 22$ (the +220). (if they win by a goal, you lose the bet).

You can understand the math easier if you just click an option and look at the bet slip.