Don't watch videos about R!

Or really, don't watch any videos about anything if you actually want to learn. In my experience, Youtube is full of videos by people who are good and fast at something pretending to teach you how to do it just as well and fast when in fact they're just showing off. Without even meaning to. And then there are those who are bad at something and are still trying to teach you, and since you don't know anything you can't even tell the two apart.

When you want to learn, use written documentation and tutorials, which es especially easy in anything related to programming. People who write good code also tend to write good English.

Simple rules:

1) When you want to learn about relationships and sex, don't watch porn.

2) When you want to learn about anything else, don't watch Youtube.