basically we learn about different sounds & types of things different kinds of languages have.
here's the one interesting thing we learned tho; sometimes a language will basically be a descendant of another language, but one or both of the ppl w/ the language don't want 2 admit it. There's a country in Europe that claims they can understand Macedonian language, but Macedonians claim they can't understand the other. When the presidents met once, the Macedonian brought a translator, but the other president said he understood the entire conversation & didn't need the translator.
Also there's a poor country in Africa that claims that their language is an ancestor of another richer country's language. However, that African country looks down on them, calling them "uneducated & illiterate," so they don't even want 2 b affiliated w/ them, so they claim that the languages aren't similar.
And finally, India & Pakistan have pretty much the exact same sounds (w/ some differences) in their languages (we even verified this on google translate) but their dialect looks wildly different, & they claim to have nothing 2 do w/ each other. (my mom didn't know this, but ik that India & Pakistan don't rlly get along very well, so that made sense. For example, the Hindi way to say "I will always love you"; "मै तुम्हे हमेशा प्यार करूंगा," sounds pretty much just like the Urdu translation, which looks like this: "میں تمہیں ہمیشہ چاہوں گا." Plus Urdu goes from right to left.
that's the only thing that's rlly been interesting to me tho.