Resolution - set the width and height of your composition in pixels. Use the drop down above to select some common presets.
Playback Start - set the frame number your playback starts at. This value can also be set using the bar with green ands at the top of the Project Window.
Playback End - set the frame number your playback ends at. This value can also be set using the bar with green ands at the top of the Project Window.
Time - shows you the current frame. It does not accept inputs but can be connected to other attributes although Frame is often a better solution here.
FPS - set the frames per second your comp will play back at.
Background - set your Color using hex or rgb values (note - only rgb values can be animated). You can also adjust your Alpha.
Playback Step - play every nth frame.
Keyframe Layer -
Motion Blur - enable/disable Motion Blur.
Shutter Angle - set the angle of the shutter. The default of 180° will give a you a 'filmic look'. That is, 50% of your frame rate.
Motion Blur Centre - affects whether your blur is backward or forward of the current frame. The default of -0.25° will centre it on the frame (your motion blur will be even in both directions of travel).
Motion Blur Samples - determine how many times the motion blur is sampled. A higher number will result in a smoother blur but also comes with a performance penalty.