Prerequisites

Get a unix-based operating system

Either Linux (Ubuntu) or a Mac.

Why? - This is an opinionated choice. Most server side software runs on Linux, the command line is a lot better than Window's command line (IMO).

Download Ubuntu (64bit) (latest LTS version)
Download Virtual Box and install it.
Setup Ubuntu inside Virtual Box. Here's a guide if you need it
- Note: check the box Download updates whilst installing Ubunutu on the install wizard.
Installing guest additions (should make your VM run smoother)
- Download the Guest Additions by running sudo apt-get install virtualbox-guest-additions-iso in terminal.
- Find the downloaded image in Ubuntu computer/usr/share/virtualbox/VBoxGuestAddition.iso, and right click => open with/disk image mounter.
- Select run and enter your password.
- Restart when prompted.

You're on your own. Disclaimer - you might break your Windows.

Own a Mac.