Coordinates for objects on the stage, such as shapes and symbols that you draw can be checked with the info panel. Knowing where an object is can be very useful, especially if you are going to tell it to go to a specific location with programming. Also if you are trying to align things on the stage (there is an align panel to help you).

The important thing to note is the difference between coordinates in
movie clips from coordinates on the main scene. Why is this important, well, if you are going to use programming to control where something should be in your movie, you need to be aware of how you are setting your coordinates.

Movie Clips (0,0) is in the middle of the symbol, at the cross-hair.

Scene (0,0) is the top left corner of your movie.
Ex. enter in numbers into the text fields to change the position of the circle; 0,0 will be in the top left corner.