diff --git a/README.md b/README.md
index 75ec052..683657d 100644
--- a/README.md
+++ b/README.md
@@ -83,6 +83,7 @@ Resources:
- [Bash Reference Manual](https://www.gnu.org/savannah-checkouts/gnu/bash/manual/bash.html) FREE
- [Ultimate Guide: Getting Started With Ubuntu](https://itsfoss.com/getting-started-with-ubuntu/) FREE
- [FreeBSD Handbook](https://docs.freebsd.org/en/books/handbook/) FREE
+- [Linux command handbook](https://www.freecodecamp.org/news/the-linux-commands-handbook/) FREE
### 4. Learn Networking & Security
@@ -92,7 +93,7 @@ Here you will need to know how a network works, how to configure **firewalls**,
Resources:
-- [OSI Model Explained](https://www.youtube.com/watch?v=dV8mjZd1OtU) FREE
+- [OSI Model Explained](https://www.cloudflare.com/en-gb/learning/ddos/glossary/open-systems-interconnection-model-osi/) FREE
- [Computer Networking: A Top-Down Approach](https://www.amazon.com/Computer-Networking-Top-Down-Approach-7th/dp/0133594149) book
- [TCP/IP and Networking Fundamentals for IT Pros](https://www.pluralsight.com/courses/tcpip-networking-it-pros) Pluralsight course
- [DevSecOps : Master Securing CI/CD | DevOps Pipeline](https://www.udemy.com/course/devsecops/) Udemy course
@@ -195,6 +196,7 @@ Resources:
- [Get started with GitLab CI/CD](https://docs.gitlab.com/ee/ci/quick_start/) FREE
- [Jenkins, From Zero To Hero: Become a DevOps Jenkins Master](https://www.udemy.com/course/jenkins-from-zero-to-hero) Udemy course
- [Learn GitHub actions](https://learn.microsoft.com/en-us/users/githubtraining/collections/n5p4a5z7keznp5) FREE
+- [Workflow syntax for GitHub Actions](https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions) FREE
- [Learn Azure DevOps](https://milan.milanovic.org/post/ci-cd-with-azure-devops-yaml/) FREE
- [GitLab Cheatsheets](https://dev.to/jphi_baconnais/series/12928) FREE