Copy Paste in exact location

Exactly what are you trying to do? Copy the position property of any layer and those same values and even those same keyframe positions can be pasted to any property that has the same number of variables in an array. 2D layers have X and Y or value[0] and value[1] properties for Position, Anchor Point, and Scale. 3D layers add the Z or value[2] element to the array. 

If you copy a string of keyframes and want the pasted keyframes to end up in the same place in time, then the CTI (current time indicator) must be in the same place as the first keyframe in the set. If you move the CTI, you'll still get the same keyframe values but they will happen at a different time.

Let us know exactly what you are trying to accomplish and we can help. In the meantime, please, spend some time in the Learn Workspace (Window/Workspaces/Learn) and try the User Guide. AE can be very confusing and just poking around in the UI or trying to follow a couple of enthusiasts' recipe tutorials on YouTube is usually a waste of your time.