I'm just going to go with quite a few lol. If I had to guess, I would say probably somewhere in the hundreds if you count all the grammer particles and combination words (that is, like for example, the word for twenty is composed of the words for two and ten)
it'd be hard to count, but i know enough to eg. understand whole sentences (depends on what they're about lol) when watching a vlive or to understand some song lyrics i still have a lot to learn though