diff --git a/content/roadmaps/101-backend/content/102-os-general-knowledge/101-how-oss-work-in-general.md b/content/roadmaps/101-backend/content/102-os-general-knowledge/101-how-oss-work-in-general.md
index d8c8981e2..7667a5215 100644
--- a/content/roadmaps/101-backend/content/102-os-general-knowledge/101-how-oss-work-in-general.md
+++ b/content/roadmaps/101-backend/content/102-os-general-knowledge/101-how-oss-work-in-general.md
@@ -2,5 +2,7 @@
 
 An operating system is a main program on computer, that governs all other applications. It allows you to use browsers, play games, print documents, launch your favorite program.
 
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://www.tutorialspoint.com/operating_system/os_overview.htm'>Operating System - Overview</BadgeLink>
 <BadgeLink colorScheme='yellow' badgeText='Read' href='https://infinite.education/view/how_oss_work_in_general'>How OSs work in general</BadgeLink>
-<BadgeLink colorScheme='green' badgeText='Course' href='https://www.youtube.com/watch?v=9GDX-IyZ_C8'> Operating System Basics </BadgeLink>
+<BadgeLink badgeText='Watch' href='https://www.youtube.com/watch?v=9GDX-IyZ_C8'>Operating System Basics </BadgeLink>
+<BadgeLink badgeText='Yellow' href='https://codex.cs.yale.edu/avi/os-book/OS10/index.html'>Operating System Concepts</BadgeLink>
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