Create a Wi-Fi hotspot in less than 10 minutes with Pi Raspberry!
( https://howtoraspberrypi.com/create-a-wi-fi-hotspot-in-less-than-10-minutes-with-pi-raspberry/ )
( s.a. https://github.com/billz/raspap-webgui = RaspAP )

Install hostapd and its interface to turn your raspberry pi into a Wi-Fi hotspot
Make sure that the Wi-Fi connection of the raspberry remains available for the creation of the hotspot.
   sudo cp /etc/wpa_supplicant/wpa_supplicant.conf /etc/wpa_supplicant/wpa_supplicant.conf.sav
   sudo cp /dev/null /etc/wpa_supplicant/wpa_supplicant.conf
Finally, edit in the file /etc/wpa_supplicant/wpa_supplicant.conf and add the following lines:
   ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
   update_config=1

   Quick installer

Install RaspAP from your RaspberryPi's shell prompt:

wget -q https://git.io/voEUQ -O /tmp/raspap && bash /tmp/raspap

The installer will complete the steps in the manual installation (below) for you.

After the reboot at the end of the installation the wireless network will be configured as an access point as follows:

    IP address: 10.3.141.1
        Username: admin
        Password: secret
    DHCP range: 10.3.141.50 to 10.3.141.255
    SSID: raspi-webgui
    Password: ChangeMe




-----
https://www.umpah.net/raspberry-pi-as-a-standalone-wifi-access-point/
-----