Frame Rate
Frame rate is how many frames/images are shown per second. This alters how fast or slow something is shown with a lower frame rate being used for time lapse and a higher frame rate used for slow motion. 60Hz is a normal speed video which is 60 frames per second.
Aspect ratio
aspect ratio is the ratio from with to height with todays standard being shown as 16:9. That is also known as 1920 x 1080 in resolution. Aspect ratio is important to cover a certain area.
Resolution
Resolution can determine the quality of the image as the resolution is shown as how many pixels are vertically and how many pixels are horizontal. The more pixels there are the higher the quality as more of the image can be shown.
Key Stone
Key Stone is how you adjust the projection to make sure it is flat on the wall. This stretched out the image on different axis to make the projection appear flat or change where it projects.