Great question! Here's a clear explanation of "whose" vs. "who's" :

Whose vs. Who's

Whose

• Meaning: Possessive form of "who."
• Use: To ask or indicate ownership or belonging.
• Example:
  • Whose book is this?
  • I met a woman whose car was stolen.

Who's

• Meaning: Contraction of "who is" or "who has."
• Use: To shorten "who is" or "who has" in informal writing or speech.
• Example:
  • Who's coming to the party? (Who is coming...)
  • Who's finished their homework? (Who has finished...)

Quick Tip to Remember

• If you can replace the word with "who is" or "who has" , use "who's".
• If you are talking about possession, use "whose."

If you want, I can provide more examples or practice sentences!