I used Windows Movie Maker, Windows Live, Wondershare Video Editor, AVS Video editor, but I want to use a better quality video editor than these. Please can anyone tell me where can I find the best video editor?
There is no best video editor, because the features that are provided for each video editor tool are different as well as the requirements. What I can suggest you is search and try as many video editors as you can and stop at the one that meets all your requirements. I recommend you to take a look through Software Informer's database, because you can find a wide variety of video editors.
You can use Joyoshare Media Cutter. I use it to crop, cut, adjust video color. It also can convert video.