Where did coordinates go in Minecraft?

I dunno

I believe its f3 to bring up cooordinates thats been a feature since the first minecraft

F3 brings up the coordinates, along with a lot of other information.

The "Better Together" update considers coordinates to be a cheat, and you have to enable cheats under Game Settings before you can turn the option to see coordinates. Exactly where you go depends on what platform you're playing it on. It also turns off achievements.