However I would urge you to use Bitwarden, not Dashline or the other programs they recommend:
https://bitwarden.com/
Bitwarden have apps for Android, iOS, Linux, macOS and Windows, and browser extentions for Firefox and Chrome, so you can get your passwords wherever. They also have a user guide you can check out if you want:
They are trustworthy and you should use one. Here is an article that looks good for some background and how to use them:
https://www.howtogeek.com/141500/why-you-should-use-a-password-manager-and-how-to-get-started/
However I would urge you to use Bitwarden, not Dashline or the other programs they recommend:
https://bitwarden.com/
Bitwarden have apps for Android, iOS, Linux, macOS and Windows, and browser extentions for Firefox and Chrome, so you can get your passwords wherever. They also have a user guide you can check out if you want:
https://bitwarden.com/help/getting-started/