Elon.Io is a website that teaches basic Japanese, Turkish, and Spanish writing, vocabulary, and grammar. As you complete each lesson, a checkmark will appear beside it in the table of contents. You can also sign up for a free account to keep track of your progress.
You can review concepts from your errors in the SRS quizzes, but these review lessons carry into every language. So, if you have reviews leftover from Japanese, you will review them during your Turkish and Spanish studies.
In Japanese and Spanish, the lessons seem to build on one another. For example, you may learn some basic kanji and then use them in the next lesson with a new grammar concept. In Turkish, however, you will have to look at the “exercises” section of the lesson to succeed in the quizzes.
Unfortunately, the lessons put a strong emphasis on translation, and the Japanese version often uses romaji instead of kana or kanji. Although it’s free, you might want to check out our other recommended resources first.