You “site it in” as we call it.
Your scope has a set of knobs to adjust the alignment along the horizontal and vertical axes, so you go to the range, put your crosshair on the target and shoot, then check where your shot actually lands relative to where you aim, for example, if your shot lands high and to the right, you adjust it up and right, then shoot again, adjust again, rinse repeat until your shot lands where the crosshairs are. You can also adjust for different ranges because bullet drop is a thing, for instance my dad sites his hunting rifle in to hit dead center at 200 yards, so at closer range the shot will land slightly high, and beyond 200 out to say 300 he just has to aim a couple inches higher, as the “kill zone” on a deer (or a human for that matter if you were using a gun for self-defense) is a roughly 6-8″ wide area, so if your bullet lands an inch or so high or low it’s still a kill.
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