I would like to learn a couple of languages (polish and Japanese - I already learned Spanish to a decent degree) but it seems like every solution is closed source.
I would use books but listening (and speaking) are very important and books won’t help with those.
What would you guys recommend?
Same for Polish. One funny thing I’ve noticed is that in one of the examples, the person tries to stay at a hotel, and the price is clearly in the old currency, which has not been used since 1997.