With the IT field having such a large area of departments and options to go into schools do not really go into much detail with their curriculum and give a broader knowledge base for people to start with. This is good to start out in the field and build your experience and determine what aspect you would like to go into with further detail.
This is where certifications come into play. They provide a means to further your knowledge in a specific area and a way to prove to employers that you have attained a certain level of knowledge. There are many certification providers for many aspects of the field. There are certifications for project management, repairing and troubleshooting pcs, build and troubleshooting networks, security, programming, operating system use and configuration, virtualization software.
There are some starting certifications that will be good to have when you all depending on where you want to go. For the system administrator the Microsoft Certified System Administrator(MCSA) or the Microsoft Certified System Engineer(MCSE) gives you the starting point for managing Windows servres. CompTIA A+ for persons who want to get into the repair and troubleshooting of computers is a good place to start. CompTIA Network+ covers the basics about building networks and trouble shooting them from the standpoint of not needing to configure the devices yourself. Network+ does more of the theory behind the network and server configurations. Cisco Certified Network Associate(CCNA) builds the knowledge base for the holder to build networks, configure and troubleshoot routers and switches.