[Crazyontap]

Sure it was this one: https://www.youtube.com/watch?v=H_oGi8uuDpA (from history)

I guess I remember incorrectly it was 3 hours long. It is only 1hr few minutes and you can easily watch it at 2x speed.

But overall Youtube is a great resource for learning new things. If you search Kotlin crash course (filter by duration > 20min) you will find ton of such courses and you can easily judge them by number of likes/dislikes.

And make sure to watch it at 3x speed with subs ON initially (video speed controller for chrome). This is truly a great hack when learning tech things via video.