How do I get in to my iCloud if I only have Apple ID and not the pass word?

Apple id is not signed in the device you knew only Apple ID and rest of account credentials ( in which password is forgotten ) , reset Apple ID password using https://iforgot.apple.com/password/verify/appleid from a web browser

See If you forgot your Apple ID password - Apple Support

Check your web browser autofill entries, the Keychain, and other records, or use Apple's iForgot service, or contact their Account Security team.

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