Some items are only available on campus or will require authentication via EUID and Password at the point of use.
Keep in mind that GIS is, by nature, very interdisciplinary. It is also a tool and, as such, can be applied to almost any profession. Many other professional organizations or certifications might be relevant to your specific interests (e.g., Professional Engineer or Certified Floodplain Manager). These are just a few examples to get you started: