Good/Well

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Quick Tip:
If it's something you DO, use "well."

Longer Explanation:

• ​Use "good" to describe a noun:
  That’s a really good song.  [describing the song]
  He's a good pitcher.  [describing the pitcher]
• Use "well" to describe an action:
  He sings really well.  [describing how he sings]
  He pitches well.  [describing how he pitches]