On one of my older machines I place VMware ESXi on it to start becoming familiar with VMware.

I wanted to build a linux server and decided to go with Fedora since I know it is pretty similar to RedHat which is what I work with at work. Iwas trying to install the:

LXD container on it which seemed successful until I ran the command

lxd init

but I am receiving an issue saying:

Warning: cgroup v2 is not fully supported yet. proceeding with partial confinement dropping privs did not work.

I read on line to use systemd.unified_cgroup_hierachy=0 to fix the issue but did kept saying "command not found". I am a little new to Linux but definetly new to containers. Was just wondering if someone had an idea or could point me in the right direction.

If you're just playing with LXD, then you can safely ignore the warning. It means that some aspects of the container won't be as securely contained (cgroups are responsible for enforcing things like CPU and memory limits) but if you're just learning about containers and Linux, it's really not a deal-breaker.

The systemd.unified_cgroup_hierachy=0 thing you've read online isn't a command, it's a kernel cmdline option. This is one way systemd gets configured (it reads the cmdline during system boot). If you really want to you can set it on Fedora with the command and then rebooting. What this option does is tell system to not use cgroupv2 exclusively (which is commonly referred to as the "unified cgroup hierarchy") and instead to use a "hybrid" mode which uses cgroupv1 (which all container runtimes support, while most container runtimes have only gained cgroupv2 support very recently).

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Impressive answer - informative and clear.