To get a full overview go here:
http://trakaxmovieexpress.com/features/
As it is laid out a little bit different than other video editors and having a big feature set it may seem harder than it is but if you have any doubts on anything there is a whole bunch of video tutorials available that is possible to see here:
https://www.youtube.com/channel/UC2eCl6Dnxfg7IXj2HxkUiOw
Think that this may be not only one of the better video editors but also one of the best apps you can get for free for Android and this without publicity!
The only negative is that you will need a somewhat powerful device to export in higher quality but this is true of any Android video editor that can render high quality video.
TrakAx