I have a problem to boot a MacOS Sonoma

Hello, I was installing MacOS Sonoma normally on a Dell Optiplex 7040 PC, I was following a guide on YouTube, everything was installing normally until I realized some details. First, although MacOS is installed on the internal disk, it still depends on the bootable USB to run the disk menu. I really don't know why this happens but as far as I understand, it is not necessary to have the bootable USB after installing the system. operational, and the other problems I have are the Internet, as I understand that the connection via Ethernet is necessary, and the Bluetooth, even if I have the antenna connected to the PC, simply does not work, and other things such as performance problems although I expected that, but if there was a method to optimize MacOS for a generic PC, it would be great if you told me about it below, and then I'll leave you the Links and other media.

YouTube Tutorial: https://youtu.be/kwbOf-dDtpc?si=OeYJttq48Yb_I4Zk