>>82180926 (OP)Why would anyone even want to learn Korean? It's a dying language, South Korea has a TFR of like 0.6 kids per woman, and North Korea is completely irrelevant culturally and economically, much like all those Sub-Saharan failed states. Japanese is also dying, but at least Japan still has 100+ million people, some cultural significance (mostly anime these days, sadly), and some economic power, it's still in the top 5 economies iirc.
Anyway, the only important languages are English (American version), Spanish (Latin American, not Continental/European), French (Metropolitan is OK, because it's much more centralized than many other languages and basically all versions other than Quebecoise and some French-based creoles follow Metropolitan French rules), Arabic (either Fus7a aka MSA, or Egyptian, both are good for their specific purposes, Fus7a for reading the Holy Quran, Egyptian for day-to-day conversations), and Mandarin Chinese (Simplified, Beijing dialect). 5 years ago I would have said Russian was important because it's one of the UN languages and it was widely used in Eurasia, but Russia is collapsing real fast economically, demographically, and geopolitically and will become completely irrelevant in a few decades, so there's no need to learn Russian anymore, besides, almost all young Russians worth talking to already speak English quite well, at the B2-C1 level on the CEFR scale, and those who don't know any English are either drunkards/junkies or retarded ziggers with room temperature IQs (in Celsius), so yeah, don't waste your time on learning Russian. And Korean. And Japanese, unless you need some basics as a tourist or want to read/watch/listen to something in Japanese.
Learn Spanish and French first, then some Arabic and Chinese.