15. Learn a new language
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Nowadays, it is perhaps easier than ever to pick up a new language. There are apps, and online courses, or even YouTube tutorials to help you learn new languages. Some of them are free, some of them will require that you pay something for the course, but they all make it worth it in the end. Whether you want to learn the new language because it’s been a life-long dream, or because you need it for a new job, it doesn’t really matter, as long as you take on the hobby seriously. Of course, if you also want to make some new friends, you can look for a language class in your city.