Section numbers refer to the day, time, and location of a course. The section number appears after the course number: PSYC100-010 refers to General Psychology 100, section 010, which meets on M/W/F from 9:05-9:55 am in the Fall 2018 semester.
Some sections are offered online, including 194 and 195. Some are reserved for special populations – such as Honors 080, 081, etc.. Some sections are not available to most students because they meet in another part of the state (or even the world!) – such as 310, 510, 710, and 070.
If a class you wish to take is full (0 seats available), check back at a later date, as a seat may become available if someone decides to drop the class. UST advisors do not have the authority to enroll you in a class that is full or restricted. For additional information, visit the Registrar’s site.