Adobe 12040118 - After Effects Standard Tutorial page 197

Drag a keyframe in the Composition panel to move one Position keyframe.
You can move multiple keyframes at one time by selecting them in the Timeline panel before you drag them in the Composition panel or
Layer panel. To move the entire motion path, select all keyframes by clicking the property name in the Timeline panel before dragging a
keyframe in the Composition panel.
Dragging all keyframes on a motion path by one keyframe
Add a keyframe to a motion path using the Pen tool
1. Display the motion path that you want to modify in the Composition panel or Layer panel.
2. Select the Pen tool or Add Vertex tool
3. In the Composition panel, place the Pen tool over the motion path where you want to add the new keyframe and click to add the keyframe.
A new keyframe appears at the frame you clicked, on the motion path and in the Timeline panel. To move the keyframe, use the Selection
tool.
Note: Though the results are different, the techniques for manipulating motion-path curves with the Pen tool work in much the same way as
the techniques used to create and modify other Bezier paths, such as mask and shape paths.
Sketch a motion path with Motion Sketch
You can draw a path for the motion of a selected layer using Motion Sketch, which records the position of the layer and the speed at which you
draw. As you draw, a Position keyframe is generated at each frame.
Motion Sketch does not affect keyframes that you have set for other properties. For example, if you set Rotation keyframes for an image of a ball,
you can use Motion Sketch to generate Position keyframes, so that the ball appears to roll along the path you created.
from the Tools panel.