As of April, 2016: When you click on a subject, before you click on a lesson, scroll down. If there are any "Tips and Notes" for that subject, they will appear below the lessons.
For example, the first subject is "Basics 1". Click on that, and you see "LESSON 1", "LESSON 2", AND "LESSON 3." Below that is, "Tips and notes". In this subject, There are "Tips and notes" for: Capitalizing nouns Three grammatical genders, three types of nouns Conjugations of the verb sein (to be) Conjugating regular verbs Umlauts No continuous aspect
NOTE: I have heard that this only works if you are using the Duolingo website on a computer--that it does not work on a Smartphone. I don't have a smartphone, so I can not confirm this.
It also works if you use the website on a smartphone (just not in the apps, unfortunately).
The website works quite well for lessons and tips on a mobile browser, but the comments can load very slowly and often crash. I recommend doing revision on a computer occasionally, just to make better use of the extra resources people mention in the comments.
Can anyone tell me, if you're in the app (not website or mobile website) can you click this link successfully? (It's to the tips page for the first lesson, if you scroll down).
>so is this a question or is it supposed to be they either have a son or a daughter or something like that?
The sentence does not have a question mark, so it is not a question. It may be a reply to a question. For example, "Do they have any children?" "They have a son or daughter." I think the sentence is a bit awkward. I would have said more in an answer to this question. "They have one child. I can't remember if it's a son or daughter."