The best app to add subtitles to the video
This is the best app that I could find to add subtitles to the video. It has a really simple interface and gives a lot of opportunities to the user.
At first, you choose the video or film the new one. Then you can add different layers of subtitles, put them either on the top or on the bottom of the page. You can also choose the time of the start and the duration of their appearance on the screen. Different fonts and sizes are also available.
This is an example of all that you basically can do inside the app. The only con that I could find is that the is a limited amount of letters that you can put for a certain page, especially if the video is placed vertically.
But of course the best way to get used to it and get to know the basic principles is to download it yourself and give it a try!