icloud on mac does not have "Forgot your password?" How do I reset password?

Look in Applications/Utilities/Keychain Access to see whether you can find your password there. Failing that, go to https://iforgot.apple.com and sign in with the ID you use for iCloud to reset (not retrieve) your password.

If the Apple ID is set up with two factor authentication , the forgot password option is not shown .https://support.apple.com/en-in/HT204915