How do I update my Mac mini to mac10.14?

How to Upgrade to  macOS 10.14 Mojave:

These Mac models are compatible with macOS Mojave:

• MacBook (Early 2015 or newer)

• MacBook Air (Mid 2012 or newer)

• MacBook Pro (Mid 2012 or newer)

• Mac mini (Late 2012 or newer)

• iMac (Late 2012 or newer)

• iMac Pro (2017)

• Mac Pro (Late 2013; Mid 2010 and Mid 2012 models with a recommended Metal-capable graphics card: Install macOS 10.14 Mojave on Mac Pro (Mid 2010) and Mac Pro (Mid 2012) - Apple Support

For details about your Mac model, click the Apple icon  at the top of your screen and choose About This Mac. 

❗️– IMPORTANT! – Backup your data. (You’ve been warned.)

Learn How to Back up your Mac with Time Machine:

Back up your Mac with Time Machine - Apple Support

🖥 – Check compatibility of your Mac with newer versions of macOS.

How to get old versions of macOS - Apple Support

✅ - Using Safari only, download the macOS 10.14 Mojave upgrade installer here:

https://itunes.apple.com/us/app/macos-mojave/id1398502828?mt=12

The download will place the "Install macOS Mojave" app in the Applications folder. Double-click the installer to begin the upgrade process.