1. Use a password manager. I really like Bitwarden because it's FREEEEEEEE and multiplatform. Me and my wife share one Bitwarden account. She uses it on iOS and I use it on Android and Windows.

I use it almost everyday to help me login for work related stuff at home but also use it to help me login to plenty of other stuff as well and it allows me to keep stronger passwords on things like banks.

2. Turn on two factor authentication.

Here's FB's instructions on doing that. Pass it on to your less tech savvy friends and family.