How do you do 'crochet cast-on?

I looked in the videos under cast on and I don’t see one for this. I am I just missing it ?

The Einstein pattern calls for this for the gauge swatch.

I googled and found this tutorial:

I didn’t think to check

I found this there.

I love seeing it being done. I don’t think I’m alone in that.

I hope this will help others that have never used the crochet cast on,the lady makes it so easy to do.