Welcome to UMD! As a student here, you will have many opportunities to interact with and utilize the technology resources on campus (or virtually). We've attempted to compile most of the commonly used services and tools here, but if there's something you can't find, here's a tip:
Try typing d.umn.edu (or umn.edu) and the word you are searching for into Google. It will search the website you listed for references, and should get you the most accurate results. So, for instance, if you are looking for information about UMD's wireless network, you could type "d.umn.edu wireless" in, and you'd get the ITSS wireless page as a top result.