I think google is an imperative verb here. You're supposed to google (as in search for) Linears Videos.

https://m.youtube.com/watch?v=Wo2m3jaJixU&ra=m

https://m.youtube.com/watch?v=WxK11RsLqp4&t=2175s&pp=2AH_EJA...

These are original video. Very clear and a way better than the blog post.