Searching on the Web in your Target Language.
I found one of the best ways to get more involved with new vocabulary, and how sentence structures are formed in my target language(s). By searching things on the internet, such as recipes and news from countries that speak that particular language. It's a great way to get used to seeing how your language works! :) How do you use resources outside of Duolingo for advancing in your learning process?
I like to use Google Deutschland to look up "wetter in kalifornien" every morning. (wild cackling) Also, a lot of the recipes I need, I look up in German, because the ingredients include some great vocabulary, and often there are pictures with the text.