The basic process of making a video needs to be understood, the first is to edit the video, followed by adding subtitles, and finally adding music. Once we have the video shot, it's time to move on to the editing which requires a certain amount of skill, we have to cut out what is not useful and splice multiple shots together.
Now many mobile apps can meet this need, after the video is completed, you need to add subtitles, so that everyone is clear about their content, and finally with music, to cause everyone's **** song.