In the menu bar, choose Composition > New Composition to create an empty composition. Use the preset drop-down menu in the Composition Settings dialog box to choose a preset resolution. You can customize a preset by typing in your own values, like width, height, frame rate & duration
Drag footage onto the new composition icon in the bottom of the Project panel to automatically place it in a new composition, matching the footage settings exactly.
Compositions can contain layers generated within After Effects and layers from external files such as files from Illustrator or Photoshop.
Compositions are composed of a stack of layers in the Timeline panel.
Layers can be moved vertically to change appearance in the stack, and horizontally to change the appearance of layers over time.
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