Keep a different, strong password for every account — a password made from a name or a date of birth is easy to break. The password is made in your browser and is never sent or saved anywhere.
No. The password is made only in your browser — it does not go to any server and is not saved with us. It disappears as soon as you close the page.
16 characters, with all four types, is very strong for everyday use. For important places like banking, 20+ is better.
If one site leaks, that same password can open your other accounts too. A different password for every account is the real protection.