After logging you will be redirected to the main page of the course you're enrolled in.
Just above the course description you can see your current progress in the course program.

You can click on the module or lecture name to get directly to the module or lecture page
In the left side of the page the entire structure of the course program is always visible.
Click on a seminar, module or lecture title to get access to its content

Please note that access is granted only to the lectures of your current module.
The content of modules that you have already completed remains available.