The top level apps are avid, premier, & final cut pro (mac), (I use the latter 2.) There's heaps of others that are still very effective & don't cost anywhere as much. All these apps have their own forum by the way. Anyway here's a starting point: http://www.videohelp.com/ And do a google for what you're looking for. (By the way, video editing will require certain codecs depending upon what the target media is.)