Currently Being ModeratedMar 22, 2013 10:36 PM (in response to kathykgb)
Movie files (m4v) = Movies
Music files (m4a) = Music
Pictures (iphoto) = Pictures
MAS downloads = Apps
Backup.dbs = Backups
If not listed above? then = Other
A lot of stuff can be in "Other" and you need a bunch of it (like OS X itself).
Take some time to right click on various folders and do a "Get info". How big is your home directory? If you are at 532, then most of that...like 90%+... should be in your home folder. Now move to the home folder and do some house keeping.