I have trained more than 1200 direct and 45000 online students for CCNA, CCNP and CCIE Routing and Switching courses.
I started as a Microsoft guy (like most of network experts!) and then ended up to become a network expert, first as a trainer and video tutorial presenter and then as a consultant for many small to medium to large enterprises. This consultant role gave me some huge and precious experience that I could add to my courses and make them richer than before.
I hope my courses on Udemy can help you to achieve your goals and become the one you wish to become.
Good luck with your studies!