Understanding OAuth 2 for Beginners: Easy-to-understand Explanation

If you're confused about what OAuth is exactly about, how it works and looking for easy-to-understand explanation about the basics of OAuth - this video is for you.
Throughout this presentation, I'll help you get better understanding about the basics and fundamentals of OAuth 2.0 specification. In detailed, you will learn:
What is OAuth 2 ?
OAuth 2 Roles: resource owner, resource server, …
OAuth 2 Concepts: authorization grant, access token, refresh token,…
OAuth 2 Abstract Protocol Flow
OAuth 2 Example with clear Explanation
OAuth 2 Authorization Grant Types or Authorization Flows