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The timeline and the Channel Box offer a few basic controls for creating and editing keyframes. However, when you're refning an animation, the controls in the Graph Editor offer greater flexibility as well as visual feedback on the interpolation between keyframes. To open the Graph Editor, choose Window Animation Editors
Graph Editor. You can also set a viewport to the Graph Editor view.
THE GRAPH EDITOR AXES
The Graph Editor is a two-dimensional display of the animation in a scene (shown here). The Graph Editor has two axes: x and y. The x, or horizontal, axis typically displays the time of the scene in frames. As you move from left to right on the graph, time moves forward. Moving from right to left means going backward. It is possible to go into negative keyframe values if you create keys to the left of the zero marker.