Update 101-oauth.md (#1125)

content/roadmaps/101-backend/content/109-apis/106-authentication/101-oauth.md

@@ -1 +1,13 @@
-# Oauth
+# OAuth
+
+OAuth stands for **O**pen **Auth**orization and is an open standard for authorization. It works to authorize devices, APIs, servers and applications using access tokens rather than user credentials, known as "secure delegated access".
+
+In its most simplest form, OAuth delegates authentication to services like Facebook, Amazon, Twitter and authorizes third-party applications to access the user account **without** having to enter their login and password.
+
+It is mostly utilized for REST/APIs and only provides a limited scope of a user's data.
+
+<ResourceGroupTitle>Free Content</ResourceGroupTitle>
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://developer.okta.com/blog/2017/06/21/what-the-heck-is-oauth'>Okta - What the Heck is OAuth</BadgeLink>
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://www.digitalocean.com/community/tutorials/an-introduction-to-oauth-2'>DigitalOcean - An Introduction to OAuth 2</BadgeLink>
+<BadgeLink badgeText='Watch' href='https://www.youtube.com/watch?v=t4-416mg6iU'>What is OAuth really all about</BadgeLink>
+<BadgeLink badgeText='Watch' href='https://www.youtube.com/watch?v=CPbvxxslDTU'>OAuth 2.0: An Overview</BadgeLink>