Simple Camera Question

Hi,
Simple Question, how to I change the width and height of the camera and where it renders. I see all these great portraits of characters that are taller than they are wide. Are they just cropped or adjusted in Blender? Any help is appreciated!

Render settings tab > dimensions. Punch in any numbers you want for resolution. Also, you can adjust framing specifics (focal length, sensor crop, etc) in the camera panel.

thanks! worked perfectly