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Regarding this, does a projector need to be centered?

Ideally, the center of the projector's lens should align with the horizontal center of your screen, although some projectors do allow for offset installation. If you can't have your projector dead center, for whatever reason, be sure to look for projectors with a lens-shift feature.

can you put a projector at an angle? Many projectors today allow for a shift function. Its most commonly used to either raise it higher without mounting it in the ceiling and inverting. But the point of all this is that you still want to have the projector point at a 90degree angle from the projection surface to avoid having to use keystone.

Similarly, why is projector crooked?

When a projector is not centered directly in front of the screen but tilted or angled toward it, the resulting image will be distorted into a trapezoidal shape. With automatic keystone correction, the projector will automatically detect and correct the distorted image, with the touch of a button.

Can you adjust projector screen size?

Press the Screen Fit button on the projector or remote control. Move the projector as necessary to display the message in the middle of the screen. Zoom into the image until its yellow frame extends beyond the edges of the screen. Press the Screen Fit button again.