Learning more than one language at a time?
I see some people are learning more than one language at the same time. Is this a good idea, do you find it easier learning two at the same time? Or should I stick to one?
If you're learning your language from scratch, I would definitely stick to one at a time. This is especially true with Duolingo because you will learn many of the same vocabulary words in all your languages and 4/5 of them are so closely related that it's easy to become mixed up.
If you have outside knowledge of a language, I wouldn't count it towards this total. For example, I spoke French before starting Duolingo and have been learning Spanish in real-life classes. German and Italian are sufficiently different that (so far--I have only just begun German and am very beginner in Italian) I'm not having trouble learning them together.