toolbar provides buttons for the most commonly used keyframe tasks.
only buttons that can be used at a given time are available. when you hover your mouse pointer over an available toolbar button, you'll see a tooltip describing the button.
tracks and ruler the tracks represent the progression of your clip over time, with the ruler above the tracks denoting your clip's frame numbers.
keyframes can be created on all tracks except the topmost track. you can click a track to switch to its corresponding page. for example, clicking the transform track displays the transform page.
keyframe symbols whenever you change an effect setting, a symbol such as
appears on the appropriate track, representing the keyframe you've created. for example, in the preceding illustration, the 
symbol on the transform track at frame 0 represents a transformation created at the beginning of the clip. for more information, see "creating new keyframes" on page 90.positioner you can use the positioner to indicate where you want to create a keyframe. you can also preview an effect by dragging the positioner as explained in "previewing your effects" on page 69. to move the positioner to a particular frame, enter the frame number in the current frame box, or click the frame on the ruler.
zoom buttons you can zoom in or out to view keyframes by clicking the zoom buttons. depending on your zoom setting and the length of your clip, only a portion of your clip might be displayed inside the tracks. if this is the case, you can scroll forward or backward through the runoff portion of your clip by dragging the positioner.
right-click pop-up menus you can right-click any of the effect controls to display a context-sensitive pop-up menu. for example, if you right-click the ruler, a pop-up menu appears that includes the zoom to extent command, which zooms your clip to fill the entire length of the tracks.
right-clicking the positioner or the ruler displays a pop-up menu that includes commands for moving the positioner, such as snap, which makes it easier to drag the positioner onto a keyframe or vice versa.
for a complete list of shortcuts available for working with keyframes, see "keyboard shortcuts" on page 97.