On learning a new language

I learned Spanish as a teenager. I got to the point where I was actually dreaming in Spanish. Last winter I got the Duolingo app on my phone and have been learning Danish for no good reason other than I was watching a Danish show on Netflix at the time. I have stuck with it, though, and I can tell you that your cat is drinking my beer in Danish. I have recently been inducted into the world of Discord (as of this afternoon) and it's like learning a whole new language. I am very nerdy in some ways. I can talk about the digestive systems of goats for hours at a time, or discuss Thomas Pynchon until my gums bleed. I am not a computer person, and half of the stuff on Discord makes no sense to me. I would greatly appreciate any tips you all might have for a total newbie venturing into unknown territory, trying to decipher things that might as well be Greek. Although maybe that's the next stop for my Duolingo app.