Forum discussions are designed to help you gain and provide peer feedback. This means, when participating in the discussions, one must be self reflective. Simple responses on a discussion board may make you seem as if you are uninterested, or not knowing the material, so be sure to share as much as you know.
It is the student's responsibility to read the required material the same as in a traditional course and post accordingly with an educated response. So consider the responses on discussion boards as a form of assessment and take it seriously! Do not try to skim through the reading material and bluff on the forum, because it will be very difficult to do.
Be advised, online students also have the responsibility to be able to interact with others different than themselves or with who do not share the same opinion. To be successful, one must be open, and have a willingness to listen and share.