Build VS Latest Build

I was wondering if someone could explain what this means?

Im running 2.1 build 1, it says the latest version is 2.1 build 2

Whats this mean and additional, how to do i update?

I have mine connected to the cloud which i heard was the best way to update but when i go to update is simple asks if i want 2.1.1 or 2.1.1-dev

Right now the latest build is v2.1.2 and you can upgrade to it using → Upgrading CyberPanel - CyberPanel