The four main windows in FCP are:

1. Browser – this is the bin where all your video, audio, stills, and sequences are kept.
2. Timeline – this window shows the linear sequence of images and sound as they are layered over time. This is where you assemble your final cut.
3. Viewer – this window allows a preview of clips that can be edited before they are placed in the time line.
4. Canvas – this window shows what has been assembled in the Timeline window.