Prologue
What is it about? There is a company that develops and distributes a password safe - Bitwarden. Bitwarden is a central server that stores an encrypted database of logins. This database can then be accessed with numerous clients. If the server is hacked, this data is still sufficiently secure because it is encrypted! If you trust the provider 
The software is open source and the source code can be viewed on Github etc. This is what Bitwarden writes about itself.
Bitwarden is an open source password manager. The source code for Bitwarden is hosted on GitHub and everyone is free to review, audit, and contribute to the Bitwarden codebase.
We believe that being open source is one of the most important features of Bitwarden. Source code transparency is an absolute requirement for security solutions like Bitwarden.
Every company wants to earn money, so they also offer a service to create and use the password safe directly on their servers. For security reasons, no problem, as all data is stored in encrypted form. The prices are perfectly fine and for a single account you can also use it for free. But, as my trend is away from such things, it has to be a solution that you run yourself. Yes, for the cost-conscious user, not the best solution, but control costs something. As a small suggestion, what do you do if the NSA pulls the plug on Bitwarden? Very unlikely, but I can still remember a tool that no longer exists.
How do you come up with an idea like that? Well, that's what happens when you talk to professionals about all kinds of things in the computer world and they point it out to you. Thanks Nico! And since I'm always curious, I try out a lot.
And now let's put this into practice…
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You can find the complete article in my forum -> https://linux-nerds.org/topic/1506/install-vaultwarden-deb-package-on-debian-bookworm-12-server