It means "good afternoon", or more literally, "good afternoons", in the plural. You could also say "buena tarde", but the plural is much more common.
'Buenas tardes' if earlier, or 'buenas noches' if later.
buenas noches amigos I've had 8 years of Spanish and am currently in my ninth.
it means "how are you when you get a good grade"
I get good grades.
good day or good morning
Have a good night.
You need good days.
In Spanish, it means "she is good".
good evening and good night
Good night to all.
it means "goodnight, kisses"
"Buenas nachoes y gracias" appears to be a misspelled phrase that doesn't have a specific meaning in Spanish. "Buenas noches y gracias" means "good night and thank you" in Spanish.