I speak 2 foreign languages fluently, one of them is English, in which I got fluent by watching shows over the years (mainly Star Trek series and The Simpsons)

I speak 2 foreign languages fluently, one of them is English, in which I got fluent by watching shows over the years (mainly Star Trek series and The Simpsons) with and without subtitles (first translated, then original English), and by reading a lot. Hard to say how many years it took, since I was a kid back then, but I got fluent enough to move to and study at the University level in the UK. The other story is I got a girlfriend speaking the other foreign language (Slovak). We speak English and her language (foreign for me) interchangeably. We also lived in her country for some time. Time we spent speaking, listening and reading her language made me fluent. No special tricks, courses, apps... Just practice, asking questions and learning. I got fluent in about a year, but bare in mind, Slovak and Polish (my native) share a common root, so it wouldn't have been as easy with something like Chinese or even French.