F5 – Insert a blank frame - Extend your animation over multiple frames without changes
F6 – Insert a keyframe
F7 – Insert a blank keyframe
F8 – Convert to Symbol
ENTER - Plays your movie in the timeline
CTRL + ENTER – Previews your final movie (also creates an .swf file)
SHIFT + F5 - Removes frames
SHIFT + F6 - Removes keyframes