This is the 7294th most frequent Spanish word.
good
The Spanish word for "good" is **"bueno"**: of high quality, virtuous, or satisfactory.
Here, 'bueno/buena' is used as an adjective to describe the quality of the book.
Este libro es muy bueno para aprender español.
This book is very good for learning Spanish.
In this sentence, 'bien' is used as an adverb to describe the state of feeling.
Me siento bien después de hacer ejercicio.
I feel good after exercising.
In this instance, 'buen' is used as an adjective before the noun 'día', where it changes to 'buen' instead of 'bueno' due to placement rules.