Couldn't there be a "next task" link on these pages? It's somewhat invonvenient when trying to get up to speed to have to go back to the tasks list simply to select the next link on the list. I have (now, just) noticed the links at the left, but since they appear below the level of the content they are not obvious to an inexperienced user, who might anyway prefer to simply go through the lessons/tasks in sequence.
And, by the way, I am still exceedingly puzzled as to why you had me sign up for bettercodes, given that everything so far appears to be working with a local repository. So it mght be better to flag that this isn't needed until later. Or, better still, not to specify that task so early.