These are video learning resources for the course. They are posted in order (first to last) so you can scroll through them easily to watch them. There is a second page with the last few videos of the course which you can access by clicking the link 'Next' at the bottom right of the page. If you go to the overview page there is a list of all resources in order, with links to each part, so if you are watching it in sections that will be the easiest way to dip back in to the point you'd got up to. Once you have followed a link you can skip forwards to the next video with links underneath the video you've been watching.