Finally, I took the LPI Linux Essentials and passed it. Next, I will start to study for the CompTIA Linux+/LPIC-1 certification. I used the following resources to study for the exam:
1. All in one LPI Linux Essentials Exam Guide
2. I set up a virtual lab with CentOS, Ubuntu, and OpenSUSE virtual machines.
3. Linux & LPIC Quick Reference Guide that I found while browsing the Internet
http://perso.crans.org/~raffo/books/linux-lpic-guide.pdf
4. Free Study Guide:
http://shop-download.linupfront.de/c...-manual-cc.pdf