Time for action — copying and pasting keyframes
Keyframes like just about everything in Blender can be copied and reused. Here you will learn to copy a keyframe and place it elsewhere in an F-Curve:
Darken the arrow button in the Graph Editor and select the cube in the 3D View.
In the Graph Editor, click on the triangle next to Location. Click on the word Y Location to select the F-Curve. Select the keyframe for the Y Location at frame 20 with the RMB.
Press Ctrl+C to copy the keyframe.
Move the current frame indicator to frame 14. Press Ctrl+V to paste the keyframe.
Press X to delete the keyframe you copied. Press Ctrl+Z to undo the deletion.
What just happened?
You discovered how to copy and paste keyframes in the Graph Editor. Ctrl+C and Ctrl+V are the same commands as PC or Linux machines use to copy and paste. Then you deleted the keyframe. X is the key to press to delete things in Blender. And finally you discovered that Ctrl+Z undoes the last command.
Keyframes for properties
You can move...