What is the best way to download YouTube video from YouTube app?

Is there any trick you can use to download videos from YouTube? Check out the responses from our experts.

Many a time we want to save or download the YouTube video to view at later but the YouTube app by default does not allow to download the video. Though it can allow taking a particular video OFFLINE it cannot be accessed by the file of that video.
I want to learn how to download the YouTube video by YouTube official app by any trick or by coding.