When do I use bien or bueno in Spanish

Explanation: When to use bien and bueno/buena/buenos/buenas

• Bien: Means "well" and is used as an adverb to describe verbs, adjectives, or other adverbs.
  Example:

  • Él canta bien. (He sings well.)
  • Todo está bien. (Everything is fine.)

• Bueno/a/os/as: Means "good" and is used as an adjective to describe nouns.
  Example:

  • Es un hombre bueno. (He is a good man.)
  • Ella es una persona buena. (She is a good person.)

• Buen: A shortened form of bueno, used before a masculine singular noun.
  Example:

  • Es un buen libro. (It is a good book.)

Summary:

• Use bien as an adverb.
• Use bueno/buena/buenos/buenas as an adjective.
• Use buen before a masculine singular noun.