During a live training session, you have the option to be on video and audio. You can ask questions about the module being covered and practice demonstrations with the trainer and other students. It is best to only attend sessions for modules you are currently on or have completed. The live session does not replace your independent study on the module. It is best if you have at least reviewed the module prior to attending. If you have not, you will be asked to simply observe the class.
If you are attending an open module sessions, you can ask questions and work on any module.