I started Chinese from scratch. I am disappointed, the course lacks structure and just throws new words at you without explanation. Frankly, I got more context in Duolingo, since community questions fill out the gaps there. For example: in Chinese "to "be" is either "shì" for nouns or "hěn" for adjectives. In Busuu, you start with shí, but when hěn appears there's no explanation on what the rule is. A single sentence would do. Also, there are mistakes like incorrect accents.