you are going to be looking at Adobe Premiere or Final Cut Pro from Apple
yes u r right, but final cut pro is so expensive. I think I will look for it on the internet for free. thank you
VisualHub is considered by many to be the best there is - or was, seeing it was discontinued - but it's still about ... Visual Hub Still the Best Free Video Converter for Mac | OS X, Software and Applications. Look carefully for the download link, use at your own risk of course.
Sorry - should have read your post more carefully, VH is a video converter, not editor, but you may still find it useful.