As we know youtube app is very great app all over the world.
Youtube allows you to watch any video or trailer or and movie in different resolutions.
Now a days very much improvement is there in youtube app.
Buffer speed is also increase and resolution also set automatically according to connectivity speed
Also there is a option to set resolution mannually but due to low speed it will take time to buffer high resolution.
There is also an awsm function in youtube that mostly videos can be saved to watch later.
You can save any video and watch it later in free time without any buffring.
You can also create your channel on youtube and upload videos and make them monetize so if your videos get high views then you can earn money from youtube.
So try once and learn and earn.