You should be familiar with the names of the window elements:
The most important elements are the sprite editor, the timeline, the color bar, and the preview window.
The timeline is not visible by default, you can make it visible from
View > Timeline menu option or pressing Tab key. (Also it popups
automatically when you add a new frame or a new layer.)
You can drag-and-drop tabs to a side or duplicate them
using Ctrl or Alt keys:
SEE ALSO
Color Bar | Context Bar | Sprite Editor | Status Bar | Tabs | Timeline | Tool Bar