Question about adresses

Ok iam sorry if this is a noob question but i was on vacation so dont the new shit etc.... but before i did go to vacation there wear new adresses and uhm they said they change every time but if they do change how people now make trainers since they change they will not work anymore i'am really sorry if this is a noob question

They change almost always when K2 updates warrock. Anyway theres several addresses whats difference for everyone