How do I get more lessons...
I am working through the food lesson, and after getting about 1/3 through, (95 of 235 points) I am only offered the option to refresh the skill rather than move on to the next lesson. Is there a limit to how much can be done at one time?
Anything you do that gives puzzle pieces in that category will advance it further until you've mastered it. You have to at least get to the checkmark in the skill to move on.
ou have to do the Phrases lessons and advance in it also, then you unlock the next one.
Not 100% sure about this but I think that after you learn a skill, while viewing that skill, you can only get more points by refreshing or translating sentences. You can do other things outside the skill to increase it's points though - like reaching a new level.