My Japanese teacher did warn us that when Japanese people say the know “a bit” of (Spanish or English etc.) they usually mean good enough to hold a social conversation. So you shouldn’t say you know “a bit” unless you can hold a somewhat coherent conversation because you’ll be expected to understand more than you think.
I’m in Japan, I swear. Gundam javert
Favorite thing about Japan. It always has to boil down to one thing, doesn’t it. As much as I like for that to be the case, just to make it easier to answer this question that everyone wants to know.