Earlier quoted context omitted.
> [learning by translation] [is] an utterly broken approach to learning languages I speak one foreign language fluently, which I learned in a traditional classroom environment with a teacher, and recently started to learn another language with Duolingo. I actually find their "learning by translation" method possibly easier (and definitely less boring) than the traditional "keep learning all the different grammar comb…
> traditional "keep learning all the different grammar combinations first" approach That's not better than Duolingo, no. Duolingo is OK initially (especially if you need to learn a new alphabet), but then quickly move on to * https://www.languagetransfer.org/ (will give you a good understanding of the principles of the language but without feeling like a grammar book) * https://www.pimsleur.com/ or similar audio cour…
Hours into Duolingo I'm repeating total nonsense like "the man is a boy" and "the turtle has green pants," but with Pimsleur, after the same amount of time, it's right into practical stuff like "I would like something to eat" or "I don't understand X but I do speak Y."
Having an extensive vocabulary of random words isn't particulary helpful except to extrapolate meaning out of conversations you don't fully understand, and almost certainly cannot contribute to.