Moin got a PC today but don't have a WLAN stick. But an Xbox one. So can I connect the LAN plug to the Xbox and to the PC so that the Xbox gives me Internet for my PC?
I hope I understood you correctly and say no.
The XBOX is not a router and can only receive the Internet, either cable or Wi-Fi. But can't redistribute. You can only attach the PC to the router with a cable.