"Question-and-answer" is an opportunity at a meeting to ask questions and to get answers from experts, or an informational session where one can ask for additional information after someone has made a presentation.
Many websites have question-and-answer pages where they write down the most common or most frequently asked questions they receive and the answers to those questions.The discussion during the previous lesson, number eight, was a question-and-answer session, because Shawn was taking questions from the people at the meeting.
Shawn says that he thinks the group is heading down the right path with its discussion."To head down the right path" means to work on the right thing, or correct thing, in the right way, or to do what you should be doing.
A "path" (path) is like a road.It's a place where you walk, normally, but here it means the direction that they are going - the things that they are doing.
So Shawn is saying that their discussion was focused on the right problems, the problems that they need to address.