I agree duolingo is a good start. What are your methods for acquiring different languages? Besides regular courses of course.
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I mean language learning is really subjective, everyone gotta figure out what works best for themselves imo.
That being said, I can't imagine duolingo, babbel, etc actually being good for anybody. The only thing it's great at is staying motivated (with it's game-like approach), and you learn some vocabulary. But the sentences are the opposite of natural, you don't really learn any authentic pronunciation nor how to understand actual people talking due to the robotic voice it uses.
If you really enjoy duolingo, go for it, it certainly doesn't harm. But I'd be willing to bet you'll only make very slow progress when it comes to actually learning the language.
What you what is immersion and lots and lots of input. Read stuff in the language you want to learn, watch movies, TV, listen to radio, podcasts, etc., etc.. Music can be good, but be careful because a lot of the language used is "poetic", and uses lots of words or weird structures that you won't ever really use when actually speaking the language.
Most importantly, find some stuff that's interesting to you, and that you like consuming. If it becomes a chore, chances are you've already lost.
And of course talking with natives is massive, but not always easy to organize, and some people have huge inhibitions when speaking a foreign language. In general, just talk whenever you've got the chance and don't give a fuck about how many mistakes you might be making.
Beyond that, it really depends on you individually, and what you want to achieve. I find learning vocabulary very helpful and I don't really dislike it that much, so I'm doing that. Others really need to understand the grammar behind it fully and focus on that stuff. If you want/need to be able to write well, practice that and try to find someone correcting your mistakes.
For example with Polish, I never bothered with learning how to write, so I'm absolutely horrible at that, and since I don't really like studying grammar I make a lot of mistakes there. On the other hand, I can understand virtually everything (maybe not every word, but the general meaning), and am pretty fluent when talking (kinda depends on the topic though).