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I used Rocket Languages as a valid help in learning languages. It is incredible how fast you can learn with only 30 minutes a day. I am learning Mandarin, and, believe me, the course is great. Do not pay too much attention to who tells you learning Chinese is impossible, and online courses do not work. You should see the face of my Chinese colleagues and customers when they hear me speaking Mandarin. Now, they are the ones who think: "That's impossible!"