With the widespread use of cell phones today everyone who comes to visit wants access to your WiFi. Not wanting to give out my WiFi key to the world, I used to set up a second router in my house and give out its credentials. Now I use Windows 10.
Click the Notifications button (next to your system clock) to open Manage notifications. If the full list (above) does not display, click Expand to show it then click Mobile hotspot.
Right-click the now blue Moblie hotspot and select Go to Settings.
Click the Wi-Fi radio button to select it and then click Edit.
Enter a name for your network and give it a password. Mine is simply Guest/guest123.
When I turn off my computer, the hotspot goes away. As long as I leave my computer running, Guest access is available to any of my visitors.
Hope this was useful for you. I use it all the time.