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Because of this, you may experience conflicts after doing a Software Update from Apple. Since the XQuartz X11 package clobbers Apple's X11.app, their software update will clobber the XQuartz X11 package. OS X Software Updates have included some of the work done by the XQuartz project, but for various reasons, Apple cannot ship the latest and greatest version offered by the XQuartz site. Together with supporting libraries and applications, it forms the X11.app that Apple shipped with OS X versions 10.5 through 10.7. Like I said I don't think any of that requires a HD but please ignore me if I'm wrong.The XQuartz project is an open-source effort to develop a version of the X.Org X Window System that runs on macOS. Once any OS is installed, you can open the app store, and search for "Mojave OS" to download what is currently the latest macOS.

That will wipe the hard drive (whatever may exist on yours), installing whatever version of macOS your computer shipped with from the factory (it will be a 3 year old version) You need internet access for this to work.

You will see a spinning globe for a while.

While it is booting up, hold Command+SHIFT+R until the Apple logo shows up.

If that fails, you can install the OS from over the internet:

That will wipe the hard drive (whatever may exist on yours), installing a fresh version of whatever the latest OS was.

Click the second one down – "Reinstall macOS".

Once the screen loads, you will see a window with four options.

You will see a loading bar under the Apple logo.

While it is booting up, hold Command+R until the Apple logo shows up.

To reinstall the OS from the special storage inside your machine, boot to Recovery Mode: (I'm pretty sure it is stored independently of the HD, but I could be wrong.)

It replaces the old method where you had to have a CD or some other copy present.

It exists specifically for instances where you need to reinstall the OS, and it cannot be wiped. If your mac is 3 years old, then it likely has special storage on the machine containing the last version of the operating system that it used.