How I turned my old PC into the ultimate LAN party game server

The golden days of LAN parties are over, partly because of increased internet speeds and partly because most multiplayer games no longer use the same client-server model. But modern PCs are powerful and often easier to move nowadays as the small form factor is popular, so maybe it's time to revisit those LAN parties of yesteryear. Plus, you probably don't need a powerful server to host the games because almost any recent-ish PC will be more than enough. All you need to worry about is which games you're going to play.