We have many passwords. Unfortunately, we can't remember them all, so what do we do? We take the same one everywhere.
However, password managers help to ensure that each service has its own good password. These generate and store all the passwords that are required for our everyday services. Unfortunately, many password managers only run locally (e.g. KeppassXC) and are therefore not available on a cell phone, for example, or are stored in a cloud whose administration and access (possibly by third parties) cannot be controlled or simply costs money every month. Also, passwords for shared services cannot be shared, e.g. with family members, colleagues or customers.
A nice project offers exactly that:
Vaultwarden is a free open source offshoot of Bitwarden, the main commercial project. The mature Apps and Browser Extensions from Bitwarden are compatible to Vaultwarden and can be used 1:1.
This series of articles explains how anyone can run their own Vaultwarden service