Fiber in the past was just to meet the needs of high-performance systems, but now it has appeared in various types of networks.
If you are very familiar with copper wire, then you will soon find a kind of fiber is something completely different. Not only because of the installation process and copper very different, and troubleshooting tools are also very different. Relative to the copper wire, the fiber is more fragile, so there will be some potential use of the fault.