How to multi-boot Windows, Linux, and/or UNIX

Go to Administrative Tools and open Disk Management. Shrink the NTFS partition (at the very least by 20GB, and depending on your hard drive size), and don’t format the unpartitioned space yet.
Go to the distribution’s website,and download the UNIX or Linux disk image. Burn the image onto a CD, or alternatively install it onto a USB flash drive using programs like UNetBootin or Universal USB Installer. There is also Win32 Disk Imager along with others.
The best free Linux distributions in my opinion are Ubuntu, Linux Mint, MEPIS, Fedora, CentOS, and OpenSUSE.
The best free UNIX operating systems in my opinion are FreeBSD(especially GhostBSD and TrueOS), NetBSD, and illumos(especially OpenIndiana).
Dual-boot if at least 180GB. Triple-boot if at least 320GB. quadruple-boot only if at least 500GB. Quintuple-boot only if at least 750GB.
If you multi-boot BSD or Solaris/illumos, you probably should install it on a separate drive from Windows and/or Linux. If you install Solaris/illumos or BSD on the same drive as Windows, the Windows loader will probably not appear on the bootloader. The drive that you install BSD and/or maybe illumos on probably should be Master Boot Record.
So, install Linux and/or Windows on one (MBR) drive, and illumos and/or BSD on the other drive (which should GPT).
Remember that some hardware (most often Wi-fi, Bluetooth, printers, and especially touchscreen) might not work out of the box. You have to make sure the proper drivers are installed. Most wireless drivers are not open-source, with some exceptions. Only get illumos or BSD if you have Qualcomm Atheros or Intel wireless, because there are no known Broadcom BCM4312 drivers for those operating systems.
Windows is put by the OEM onto laptops with just the required drivers. UNIX and Linux that you install onto your PC on the other hand come with thousands of drivers, only a few of which are required for the hardware on your PC.
Fedora and Debian have policies of not including proprietary software in their repositories (If you install Fedora, see https://fedoraproject.org/wiki/Forbidden_items?rd=ForbiddenItems). OpenSUSE has a similar policy, but not as strict. Ubuntu doesn’t have such a policy and has both free and non-free, both open and closed-source software in it’s repositories.
Alternatively to multi-booting is the use of a virtual machine. If you have Windows 10 Pro or Enterprise, use Hyper-V. Remember that Hyper-V does not virtualize audio. If you want sound, use Remote Desktop or Enhanced Session. If you have Windows 10 Home, use Virtualbox or VMware. Don’t use virtual machines if your computer has small RAM (like less than 4GB). Recommended RAM at least 8GB. If you have 16GB of RAM, use multiple virtual machines (like four). Also, don’t use virtual machines if your CPU has limited processing power.
And, Hyper-V and some other virtualization software require virtualization extensions (like Intel VT-x and AMD-V) to be enabled in the firmware.
Alternatively, you could get a Linux laptop. Usually, Linux laptops have Ubuntu. You could multi-boot other Linux distributions and/or install BSD and/or Solaris/illumos alongside it. If you get two laptops, a work laptop and a home laptop, the work laptop could be Windows, and the home laptop could be Linux. It probably should not be the other way around. If you have a spouse, one could have the Linux laptop, and the other could have the Windows laptop.
If you want to play games, use Wine and/or Steam.
If this information is not clear enough, look on other sites and/or watch YouTube videos. Comment any questions that you have.

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