Well there is only one meter, and one hash mark on the meter's scale + - - - 0 - - - -
the hash mark is where your current settings are in regards to the cameras "ideal" (zero) exposure. Which could be wrong, to a degree.
You can change any of the three things in your control to get your hash mark to zero.
You can change the films (sensors) sensitivity to light.
You can change your shutter speed, which may change whether you stop motion (fast shutter) or introduce motion blur (slow shutter). Slow lets in light for longer, fast lets in light for shorter periods of time.
You can change your aperture, which will change your depth of field (google it). Wide aperture (small f/#) will give you a focused area often measured in inces to a few feet, a small aperture (big f/#) will give a focused area from a few feet from your camera to infinity.
You need to make the creative choices as to what is acceptable to change for your given image. Which is partially why people can't just tell you what settings to use for a given subject.