Sometimes when making accounts online the suggested password prompt doesn’t show up. Until now I had been using an online random password generator to make the password when the prompt is not available. I just found out that if I go to the passwords screen in settings an manually add an account the password field is pre-filled with a random password which is very convenient.
If you use Windows, you can install iCloud Keychain for Windows to access keychain.
https://support.apple.com/en-gb/guide/icloud-windows/icw2babf5e03/icloud
and/or use the Chrome extension
https://support.apple.com/en-gb/guide/icloud-windows/icw76039ec0f/icloud