Learn structure of...
When learning a new language, you may notice that the structure of sentences could be different from the language you already know. This especially happens when you learn languages from a different language family.
After learning around 100 words, you can start Test Sentences to help you memorize the pattern of sentences. This type of test also may help you to speed up remembering vocabulary as well as where and how to use them in sentences.
To practice even more, try to use the task Translate To and Translate From. In this task you can find stories written by users and try to translate them to the language you know or you are currently learning. You can also try to translate everything in the forum, from the content to each reply, to the language you know. This way, you are not only helping yourself by doing exercise, you also help others to understand what everyone is talking about in the forum.