Odds are not fixed: from the moment a market opens until kickoff, prices move in response to money, news and information.

Opening lines reflect the bookmaker's initial opinion, often based on ratings and models, while closing lines reflect all the information and money that arrived afterwards.

A move of a full point on a spread, or 20 cents or more on a moneyline, usually signals meaningful information or heavy action, while tiny moves often mean nothing.

Use line movement as a prompt to check the news, not as a pick by itself: a line can move for reasons that do not make the new price good value.