Add 'Oh My Git!' resource to Git section

Author: deepakkumar-platform

index.md

@@ -103,6 +103,7 @@ A curated, community-driven collection of **free DevOps labs, challenges, and en
 ## 🌿 Git
 
 * [Learn Git Branching](https://learngitbranching.js.org/) – Interactive visual Git tutorial for mastering branching concepts
+* [Oh My Git!](https://ohmygit.org/) - visualizes the internal structures of Git repositories in realtime
 
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