YouTube has lot of videos on Scala but not all of them are relevant for learning Scala. Below is the list of Videos which are good tutorials on Scala. For each of the below link, a brief information about the video has been given which should help understand the content of each video.
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https://github.com/abhiphull/nbshare-blog/wikiScala Tutorial - 500K+ Views

Video length - 1 hour 15 minutes
Target Audience - Beginner to Intermediate
Instruction Type - Hands on Tutorial
Scala at Light Speed [Full Course] - 10K+ Views

Videos - 8, Video length 10 -20 minutes each
Target Audience - Beginner to Intermediate
Instruction Type - Hands on Tutorial
Learning Scala? Learn the Fundamentals First! -135K+ Views

Video length - 1 hour
Target Audience - Beginner
Instruction Type - Slides
Functional Programming in Scala -35K+ Views

Video length - 37 minutes
Target Audience - Intermediate
Instruction Type - Slides (code examples)
Agenda
- Thinking less with Functions
- Thinking less with Data
- Thinking less with Patterns
Let’s Code Real World App Using Purely Functional Techniques (in Scala) - 62K+ Views

Video length - 50 minutes
Target Audience - Advanced
Instruction Type - Slides + Hands on
Goal - Build a real-world example of a data transformation process
using functional techniques dealing with issues such as control
flow and error state.
Scala Monads: Declutter Your Code With Monadic Design - 100K+ Views

Video length - 30 minutes
Target Audience - Advanced
Instruction Type - Slides (code examples)
Goal - Understand Scala design pattern: MONADIC
How to setup Scala on Intellij IDEA IDE + First SBT/Scala project - 80K+ Views

Video length - 8 minutes
Target Audience - Beginner
Instruction Type - Hands on
Scala Tutorial 3 - How to Install and Setup SBT on Windows 10 - 75+K Views

Video length - 16 minutes
Target Audience - Beginner
Instruction Type - Hands on
Run Spark Application(Scala) on Amazon EMR (Elastic MapReduce) cluster - 30+K Views

Video length - 13 minutes
Target Audience - Intermediate
Instruction Type - Hands on
Data Processing with Higher-order Methods Part 1 (Scala) - 8K+ Views

Video length - 11 minutes
Target Audience - Intermediate
Instruction Type - Hands on
Goal - Understand data processing from CSV file using SCALA higher order functions
Video Series - 6 (videos), each video under 10 minutes