diff --git a/content/roadmaps/100-frontend/content/119-graphql/readme.md b/content/roadmaps/100-frontend/content/119-graphql/readme.md
index c6070f4bb..83ffa621d 100644
--- a/content/roadmaps/100-frontend/content/119-graphql/readme.md
+++ b/content/roadmaps/100-frontend/content/119-graphql/readme.md
@@ -6,3 +6,4 @@ GraphQL is a query language for APIs and a runtime for fulfilling those queries
 <BadgeLink colorScheme='yellow' badgeText='Read' href='https://graphql.org/learn/'>Introduction to GraphQL</BadgeLink>
 <BadgeLink colorScheme='yellow' badgeText='Read' href='https://www.howtographql.com/'>The Fullstack Tutorial for GraphQL</BadgeLink>
 <BadgeLink colorScheme='green' badgeText='Course' href='https://odyssey.apollographql.com/'>GraphQL Tutorials</BadgeLink>
+<BadgeLink colorScheme='green' badgeText='Course' href='https://www.youtube.com/watch?v=ed8SzALpx1Q'>GraphQL Course for Beginners</BadgeLink>
diff --git a/content/roadmaps/101-backend/content/102-os-general-knowledge/readme.md b/content/roadmaps/101-backend/content/102-os-general-knowledge/readme.md
index c4a9305ec..286fe3ca8 100644
--- a/content/roadmaps/101-backend/content/102-os-general-knowledge/readme.md
+++ b/content/roadmaps/101-backend/content/102-os-general-knowledge/readme.md
@@ -1 +1,8 @@
 # General Knowledge
+
+Operating System is a program that manages a computer’s resources, especially the allocation of those resources among other programs. Typical resources include the central processing unit (CPU), computer memory, file storage, input/output (I/O) devices, and network connections.
+
+<ResourceGroupTitle>Free Content</ResourceGroupTitle>
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://edu.gcfglobal.org/en/computerbasics/understanding-operating-systems/1/'>What is an operating system?</BadgeLink>
+<BadgeLink badgeText='Watch' href='https://www.youtube.com/watch?v=26QPDBe-NB8&ab_channel=CrashCourse'>Operating Systems: Crash Course Computer Science #18</BadgeLink>
+<BadgeLink badgeText='Watch' href='https://www.youtube.com/watch?v=vBURTt97EkA&list=PL9hkZBQk8d1zEGbY7ShWCZ2n1gtxqkRrS&index=1'>Introduction to Operating System</BadgeLink>
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