Mark/save new words from the lessons
Is there any way to mark/save the new words/phrases you learn from the lessons, for later use (like to check if you remember the meaning after few days). Otherwise, you just learn some words today, any forget after few days.
The best way to rehearse new words you see is to do the practice. According to some of the news articles about the site, it keeps track of the words you have seen. The practice changes every time to help you refresh old words or rehearse new ones.
Bookmarking words would be useful too tho, especially inside of translations where you encounter a lot of new words that don't always show up in the lessons.