Windows 10 Mobile Hotspot.
Step 1: Connect your PC to a Wifi network that you would like to share. The details of how you connect vary. A Hotel might have one way, Starbucks will have a different way. Once your laptop is connected you will see....
Step 2: Next, open Network & Internet Settings.
Step 3: Now select Mobile Hotspot. Here is where you will need to put in a Network Name and Network password. This is the name and password that you will connect to from your other devices.
Step 4: The final step. Turn it on!. At the top of the screen is a toggle switch, click it to turn it on. Now you connect other devices to this PC. You will see how many devices are connected, currently 0 of 8. All of the data will flow through this PC's connection to the internet and will be limited to whatever speed that PC could obtain by itself.
This works for up to 8 devices within the limited range of your PC. It does not work very far inside a metal structure. My experience has shown it was only good enough for my room.