Use the noun academe when you're talking about a college or university community. The world of academe can be a little intimidating when you're a freshman.
Academe is the community and scholarly environment within an institution of higher education, and it's more often called "academia." Professors, graduate students, researchers, and undergraduates all contribute to the environment of academe, and if you plan on teaching at a university some day, you hope to enter academe. The earliest meaning, from the Greek word Akademeia, was simply "The Academy."