You begin in game with small territory. Your main goal is to make it bigger. If you go out of your territory you begin to leave snake-like body behind you. If anyone including you hits your player while you are outside, you will die. Return to your territory to make it bigger...
FPS is number of pictures drawn per second. Latency is how long it takes to send information to server and then from server back. Good FPS is 50+. Good latency is 100-...
Enable VPN only for site loading! Otherwise you would have increased latency in game.