This looks great but clicking the little green arrows doesn't actually take you to the training materials! (I'm using Google Chrome)
I also primarily use Google Chrome, and ditto, nothing happens when clicking the green link arrow.
I found out it is because pop-ups are automatically blocked.
Following step 1 and 2 below worked for me.
Although I chose a specific name in step 2, other links also worked afterwards.
I chose also the setting "Always allow pop-ups from public.tableausoftware.com".