As mentioned, Snipe-IT is web-based software, which means it requires a web server to run.
You must complete all of the steps in the installation section, in addition to configuring your server. That means you will download the software , customize your configuration files, and install the dependencies with composer, in addition to configuring your web server.
Installation should take around twenty minutes or less, if nothing goes wrong, and if you're pretty familiar with web server configuration.
You should never run Snipe-IT (or any website, ever) as a root (Linux) or Administrator (Windows). Create an unprivileged user and make them the owner of the files