the differences between buena and bien

Question

what's the differences between buena and bien?

I used to hear 1 : Es una buena idea. 2 : Fruta y verduras son muy buena para la salud.

but I also hear my Spanish teacher said muy bien when I get good grades.

I don't know when should i use buena when should i use bien?

Thank you so much for your help. I will really appreciated.

Answer 1

Have a look here Tiffany