How to Hack Server Sided Games????

Hello guys,

I would like to know how to hack online server sided games,i asked a guy and he only said hack using php and it is illegal.

I would be really appreciated if anyone make a tutorial or guide me and also would i be anymous if i use a vpn and proxy.

I would also like to know can i login any account using vpn and proxies my account would be safe.

Thanks