Why use a password manager?
The average person has dozens of online accounts. A password manager allows you to have a unique, strong password for each service without having to remember them. You only need to know one master password.
Tips for secure passwords
Bitwarden
Open Source Recommended Free tierBitwarden is the most popular open-source password manager. It offers cloud synchronization, possibility of self-hosting and regular security audits. The free version is fully functional.
KeePassXC
Open Source OfflineKeePassXC is a fully offline password manager. Data is stored locally in an encrypted database. Ideal for those who don't want to entrust their passwords to a cloud service.
You can use Syncthing or other E2EE cloud storage to sync between devices.
Two-factor authentication (2FA)
2FA adds a second layer of protection to your accounts. Even if someone gets your password, they won't log in without the second factor.