In order to share the Internet connectivity with many PCs, start by navigating to Control Panel >> Network and Sharing Center >> Change Adapter Settings.
Or go directly to the adapter settings by running ncpa.cpl in the run prompt.
Now locate the adapter through which you’re connected to the Internet. Right click on it and choose Properties from the context menu. You’d find two options: Networking and Sharing. Choose the Sharing option and tick the “Allow other network users to connect through this computer’s Internet connection”.
Now create a WiFi hotspot and connect other PC’s to it. All those PCs will be able to connect to the Internet. Note that as you add more PCs to the network, the latency will increase and you experience slower connectivity.