Ctrl+Shift+EThe graph editor opens as a panel below the timeline tracks.
The graph displays a bezier curve where:
The curve describes how the property value changes over the time between the two keyframes.
The bezier curve has two control handles (one near the start, one near the end). Drag these handles to reshape the curve:
When multiple property tracks are selected, all their curves appear in the graph simultaneously in different colors. This allows comparing and coordinating the timing of Position X vs. Position Y, or Scale vs. Opacity.
Normalize view: A button at the top of the graph scales all curves to the same 0 to 1 range for visual comparison, even if the absolute values differ.