Translation:I do not know.
You can just focus on one at a time, even though it probably looks messy lol. I guess the best way to learn a lot of languages is to finish the trees one by one, while reviewing the previous one. For me though, I think 3 totally different languages is already hard enough to handle.
I don't think so. I think you only use it when you know "someone" - so "I know her - 我认识她“。 If I'm wrong, please correct me.
It's been a while since I did a lesson where 认识 was present, but I'm pretty sure it means "recognize".
Literally the most useful phrase I've learned in my high school Mandarin class. It saved me from situations such as a pop quiz to a Mandarin speaker asking me something in Mandarin when all I know is Cantonese lol...
知 (zhi1) on its own means knowledge, know that sort of stuff. 道 (dao4) has lots of meanings, but one of the most common ones you see in daily life is road, path, way this sort of meaning.