Create a strong random password. It is made on your device and never sent anywhere.
Create long, random passwords that are hard to guess. Everything is generated on your own device with your browser's secure random generator, so the password is never seen or stored by anyone else.
No. It is created in your browser using the secure random generator built into it, and never leaves your device.
At least 14 characters for important accounts. Longer is better, and a passphrase of four or more random words is also strong.