How can be a Fortinet Network Security skills and experience?

If you don't want spend money and just want to be familiar with FortiGate Device then there are lots of video and documentation which can help you to enhance your knowledge. If you want to really certified then you can take either online class or you can join class in Authorized Fortinate Traning Center. http://www.fortinet.com/training/atc.html

Study about fortinet products.. get certified and search for a job and move on..