My friend is looking for a resource to become fluent in French, he is forced to work with it. Asked to find a certain book, but it is not yet pirated on the resources of the wiki. My guess is that pirates have better alternatives for such a thing, so I’m launching a discussion.
I only ever heard about the book “Minna no Nihongo” in the context of learning Japanese.
I was studying French too (I really should get back into it). My plan was to learn all of the most used vocabulary, the grammar and then aggresively use the language. Read books, watch YouTube videos, chat with folk online. Best way to learn a language is to use it.