Is an Ip Adresses a Must - Have for Hacking a Pc ?

hey guys ,

in nearly every tutorial i have seen they are using ip's of there victims for example in metasploit ... but no one shows how to get the ip . * is there eny way to get your victims ip ? and is it a must-have or are there other ways too ? and wich ip is " common used ip " local or extern ?

sorry guys for my mistakes :)