How to convert video correctly?

Question

Video

Hello. There are videos (cartoons) in good quality. And we will watch it on a tablet with a resolution of 10.1", 1280x800. In fact, on an old man. The main question is what is better to convert the video into, which codec, so that it is less and takes up as little space as possible.

Tablet Aver A500

Answer 1

Yes, pack in MP4, don't worry.
I use Any Video Converter, free.
It is possible through ffmpeg, but it is console.