Not ELM, it'll be on Avenue to Learn.
It depends on the course specifically...like, Science 2C00 is a series of 8 'lectures' that you have to go to. As people have stated, they're usually pass/fail, and they don't count towards your GPA or the number of units you're taking in a term--you'd take the course(s) in addition to your normal course load. They're usually minimal work