Add english courses about Linux Professional Institute Certification level one and two (#10544)

courses/free-courses-en.md

@@ -1151,6 +1151,8 @@
 * [Linux Command Line Tutorial For Beginners](https://www.youtube.com/playlist?list=PLS1QulWo1RIb9WVQGJ_vh-RQusbZgO_As) - Programming Knowledge
 * [Linux Tutorial for Beginners - Learn Linux and the Bash Command Line](https://ryanstutorials.net/linuxtutorial) - Ryan Chadwick
 * [Linux Tutorials and Projects](https://www.udemy.com/course/linux-tutorials/) - Jason Cannon (Udemy)
+* [LPIC 1 exam guide: Linux Professional Institute Certification Study Guide](https://linux1st.com) - Jadi Mirmirani (HTML)
+* [LPIC 2 exam guide: Linux Professional Institute Certification Study Guide](https://borosan.gitbook.io/lpic2-exam-guide) - Payam Borosan (HTML)
 * [Red Hat Enterprise Linux Technical Overview](https://www.udemy.com/course/red-hat-enterprise-linux-technical-overview/) - Red Hat Inc. (Udemy)
 * [The Linux Basics: Beginner to Sysadmin, Step by Step](https://www.youtube.com/playlist?list=PLtK75qxsQaMLZSo7KL-PmiRarU7hrpnwK)