How to hide the IP of all PCs on the network?

Question

network hardware

I have 4 PCs 1 router and 1 switch, internet cable
Help me figure out if I need to encrypt traffic and change IP for all devices connected via WI-FI to the router.
For example, through openVPN or SSH bodies.

Answer 1

From whom to hide? from those who are on the Internet? Then use NAT, Proxy