Free Video Editor & Movie maker is an award-winning, open-source video editor, available on Linux, Mac, and Windows. Free Video Editor & Movie maker can create stunning videos, films, and animations with an easy-to-use interface and rich set of features
ree Video Editor & Movie maker use the source code of OpenShot under license GPLv3 . Get Our Source Code  Source Code of Openshot

Tutorials:
1. Quick Tutorial  (page 2)
2. The Main window and Keyboard Shortcuts  (page 3)
3. How to Clips the Media  (page 4)
4. How to Adding text and titles  (page 5)
5. How to Setting Animations  (page 5)
6. How to Setting Video Resolution  (page 7)
7. How to setting the app language  (page 8)