Explanations of grammar
Does Duolingo include explanations of grammar anywhere? I've gone through a few lessons and found that I have to figure out things as I go, without any kind of general rules being provided. E.g., I did not see a rule that says that adjective gender has to agree with noun gender, or a rule about how to form past tense. Did I miss this somehow or does the site expect students to figure this out or memorize by rote? Thanks.