An okay-ish video. I would only recommend it if you would like to learn a little bit about an alternative Java language, Kotlin (by JetBrains). Basically, it fixes many of Java's un-intuitive "features". And, it's usuable for Android.
After the first 10-15 minutes about Kotlin features, there are Java puzzlers for the rest of the video. Code puzzlers are great ways to learn about the edge cases of a language and help you understand better why some easy code isn't working.
Video: The Unpuzzling Kotlin: Bringing Clarity to Your Code
- Danial Goodwin -