These types of course offerings are not carried out in real time. Students receive content and homework and are given a time frame for completing coursework and exams. The interaction usually takes place through discussion forums, blogs and wikis. As a result, there is no schedule for class meetings.
Asynchronous online learning environments are effective for students with time constraints or busy schedules. When you attend an online class, the classroom is wherever you are. You'll need to find a place that's quiet and free from distractions, but that offers enough space to take notes, either on your computer or by hand. You may also need a nearby electrical outlet to keep the device charged while you're connected to class.