the app is good overall. but I would give some tips to make it even more useful for those who want to learn about Japanese. Firstly, during quizzes, it is better to substitute words that are more similar to each other in the form of writing (for example, to check the word 「ギター」, it is better to put words such as ギクール　、ケーキ or just a similar set of letters next to each other). Thus, an ignorant person who has poorly learned and memorized the material will be confused, and if this person really learned well and remembered what was given to him for study, there will be no problems for him. For beginners, it is inappropriate to check a word like "かばん" next to the words "会議" or "来週", which a person has never seen or knows in his life (although this is not the most frightening example that I have met), and in most cases this person by elimination, he will choose the correct option (unless, of course, he did not particularly teach). it will even be a little more effective to put just words from the same topic, that is, from the same flash cards, from one topic. By the way , about the topics . People fit things, words or rules in their heads much better when everything was sorted out at the time of study. That is, I think that even at the most elementary level, you need to study all the words clearly on certain topics, and not add words there that do not quite fit the topic of most of the words that are in this section. For example, if the theme of the cards is “time”, then there will only be words like “second”, “minute”, “hour”, “day”, “week”, “month”, etc. Also, the study of verbs is a little problematic at the initial level, since there are no their tense forms of changes. What I really found useful were character or word spelling tests. Here you will already get caught if you do not remember how it is read and written. In general, the application, even in free courses, is a good collection of basic and not only words, if you want to attract more users, then you can add rules for constructing sentences. I love your channel and teacher Tezuka very much ♡ I am grateful for your work, I wish you success and prosperity