This sentence is grammatically incorrect, but it means: "What a good bonus/cousin!"
(It should be que buena prima for a female cousin and que bueno primo for a male cousin).
"bueno, tengo que..." means Good, I have to... [insert action here]
If you are asking what "que bueno no sabia que usted habla espanol" means, it's: "how nice I didn't know you speak Spanish"
How well you dance.
How good! In English we might say "How wonderful!" instead.
have goodnight ma'am
It is good that you are not working.
Very well, madam
Adjective: -que -qual de -bueno -lindo Pronoun -que Interjection -como
It means, "What is there [that's] good?"
How great, something new.
It is ungrammatical. It means: "that which is good in he/she uses"
"Qué bueno fue conocerte" translates to "It was great to meet you" in English.