Bookies change and move the line according to how bets are coming in. Different books will have different line depending on how their bets are stacked, and if/how they can lay off their bets.
It’s not unusual for a line to end in a whole number, the bet is just “pushed” if the outcome ends with the score equaling that line, with no money being exchanged either way.
.5 lines and “pick em” lines are possible as well. In a Pick em there is no spread.
Books will also offer other bets, including a money line that has no point spread, and often “props” bets, which can be based on coin flips, who scores first, etc….
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