It's a good idea to use a different password for different services. That way, if one of those services is compromised, it only affects that service.
If you use the same password everywhere, then you should change it everywhere after a security breach. Probably not going to happen.
If you use different passwords for different services, it becomes impossible to memorize all of them. Password managers help track all of the different passwords in a secure fashion.
Encrypting a collection of passwords is necessary if you're going to store them digitally. Good solutions exist for helping you meet this goal.
KeePass Password Safe
KeePass is one of the older open-source solutions for tracking passwords. There are clients available for most platforms.
KeePass stores the encrypted password database locally. The tricky part is keeping your key database in sync across multiple devices. Keepass doesn't have that functionality built in. I prefer to keep the database file stored locally rather than in a cloud based service. I use git to synchronize it across devices.
KeepassXC is an updated fork of KeepassX. KeepassX is a good cross platform option.
sudo apt install keepassxc
To copy a password to the system clipboard, do not open the entry details. Ctrl-C is enabled on the find / filter list. It's not available in the details.
sudo apt-get install keepassx
KeePass.info seems to be the official desktop client
KeePass Password Safe
0x8 8 Disable controls to specify after how many days the master key should/must be changed.
KeePass DX is good and open source.
KeePassXC looks like another good client
KeeWeb may be a good option to try. Found it via the Open Collective site.
Don't like this one as much.
sudo apt-get install keepass2
Open Source password manager
Uses a dedicated server that you can run locally to synchronize the password database.
Written in C# Docker images are provided for the server, and there are also lighter weight clones in Ruby that are available
Seems like a great solution that may be easier to get started with for most people compared to KeePass.
TechRadar: Popular password manager could have a critical vulnerability.
Lockwise is a newer open source solution from Mozilla that is built in to Firefox:
Firefox Lockwise — password manager — take your passwords everywhere
It looks like there may be some issues with prompting for the password to unlock the database.
How secure is Firefox Lockwise password manager? | by Joe Kreydt | Medium
Here is the open issue to track the fix:
Lockwise at DuckDuckGo
lockwise vs lastpass at DuckDuckGo
open source password manager - searches
LastPass is a popular, well regarded closed / commercial / free option.
Passbolt | Open source password manager for teams
The Best Password Manager for You - HackerNoon.com
Pass: The Standard Unix Password Manager