Time for action — exploring the Graph Editor
The Graph Editor displays the data associated with every single keyframe. It lets you adjust the keyframes and the transitions between them easily:
Move the cursor over the Timeline window and down to the Current Editor Type button.
Press theLMB, scroll up the menu to the Graph Editor and press theLMB again.
Move the cursor up to the edge between the Graph Editor and the 3D View till you see the double-headed arrow. Drag the border between the windows up till you can see the curving line as shown in the following screenshot.
Use Shift+MMB to move the graphs so that they are centered in the window.
Now, use the Ctrl+MMB buttons to scale the display of the graph so it fits comfortably in the window as shown in the following screenshot.
Select the vertical green line with theLMB. While holding down theLMB, move the mouse right and left. The line will move, and if you look in the 3D View, your cube is moving as well.
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Now the bottom...