"New concept" feature
I remember someone wrote about "concepts", but I had no idea what they were. Today I saw a "New concept" introduction myself:
Nice job, German team! Little by little Duolingo will become an independent source for learning grammar and the users won't have to consult grammar sites on every topic.
P.S. It was kind of funny to get such a "new concept" doing a lesson deep down the tree when I've apparently learned the cases already :-)
I got this in French as well awhile back. It was introducing possessive adjectives I believe. And yes I didn't get the tips until I was well into the tree and had presumably learned possessive adjectives. I liked the basic idea although after a while I kept getting the same little pop up on the same concept so it would be nice to indicate when you have "learned" a grammar concept so it didn't reappear so many times. I don't remember now if that is how I learned when to use "c'est" properly or not (I somehow attribute it to that though), but I did find them helpful at least the first time around even on concepts I was already somewhat familiar with.