Make a wifi-server from an Raspberry-Pi4

I own a Raspberry Pi4 & a cheap USB-Antenna.
Are their links i can use to configure this for a WIFI-Server, for my smartphone, with this simple setup ?
Thanks.
 
What is a "WiFi Server"?
Do you mean creating a WiFi Access point so other WiFi devices can reach the ethernet network via the RPi?
 
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