How to add simple textual animations to videos? I want to add simple textual animations to videos, just like this one from Business Insider : https://www.facebook.com/228803477461289/videos/231065770568393/

What software do I need in order to realize this ? 

I know that After Effects is capable of such things, but I'm looking for (more specialized) software with much less learning curve.
You can achieve that with ffmpeg. Draw text with drawtext command. And draw semitransperent beckground under it with  drawbox. You can see more in that question.

You can add animation of moving text  from side of video with Expression Evaluation.