F-Droid is an installable catalogue of FOSS (Free and Open Source Software) applications for the Android platform. The client makes it easy to browse, install, and keep track of updates on your device.
Nice. I just decided to try it, and this seems really nice so far. The built-in repositories feature is really nice, especially for people who are just getting acquainted with F-Droid
Running outdated versions of software, whether on your phone or the desktop, will generally expose you to more vulnerabilities and is not best practice from a security perspective.
Huh, most of the time. I mean, people like you don't have to use it at all, but I prefer to just press "Update all" once if I have >2 updates in a row.