Advantage of learning German ?
What is the advantage of learning German for the students who don't decide to travel Germany ? (For example for an engineering student who might decide to study in USA)
Just think of the fact that there are people in the world, people with personalities and ideas and thoughts in a language that you can't understand. By learning a new language it's like unlocking an a new world with an entirely different species of people. Different cultures and different ways of thinking and understanding. Before you couldn't understand them, but once you learn their language, you can unlock this entirely new world of people. You can get by in new countries and fall in love with new people who you couldn't even communicate with. You might not need it, but I think it's pretty awesome.
I have the feeling that many Duolingo users don't learn a language because of necessity or convenience, but more for the fun of it. People who NEED to learn a language should primally go to school (and may use Duolingo as a helping tool).
Anyway, learning a new language - German or other - always end up having advantages. It looks good on a resume, and may actually open more job opportunities. And don't forget recent studies that show that polyglots have lesser risks of developing a brain-related condition (stroke, dementia, Alzheimer, etc...). If that's not a plus...
If you are not in Europe and neither have plans to come, German is not so useful for you. The advantage would be personal enrichment!
Fluency in German could boost your pay by 4%. Sehr gut!
Learning different languages forces your brain to think in different ways. A sentence like "Hast du eine andere Sprache gelernt?" literally translates to "Have you another language learned?" It sounds unnatural in English but it is correct German. German makes you think outside the box if you want to understand it. I believe this type of thinking makes you a better creative problem solver because you have to use your brain in ways you don't normally use it. Plus it's a great way to pick up the ladies ;)
Reading Goethe, Zweig or Mann in their original language. Though I assume it would take a little bit more effort than completing the Duolingo tree! :)
You want to be an engineer? Then i guess that learning German would definitely be a plus in your CV in case you would apply for a job at BMW or Mercedes.
You could work for a German company anywhere in the world. But in reality there is no big advantage, other than personal enrichment.
By learning a new language, no matter what language it is, you have the chance of expressing yourself in a different language which people somewhere on the earth use
It would not make sense only if there was another language that they could have been able to use, but they decided not to learn.
Even though a lot of Germans speak and understand English well, you will discover that few courses are taught in English.
Take all the advantages that you can, you never know who may offer you a break. Being able to speak a few polite words in your non-native language in a business or social setting may just break the ice. If learning something different, voluntarily, it should be to enrich, add value and/or for the enjoyment of it. But no learning is ever lost.
my Australian daughter met an Austrian boy whose parents don't speak a syllable of English. She is learning German to get by and I have been on Duo lingo for 1 year trying to cope with the simple sentences. Hopefully I can converse with her to help each other and also should the need arise, to meet his parents. I guess that scenario could apply to any language. Its a challenge as you age - I agree with other comments especially LoveK1969