Fun thing about the switch apps forward/backwards keys is shifted tab is back tab, so alt+tab is switch forward and alt+back tab is switch backwards

I’m a regular Windows and Linux user, but am using OSX for a work project. I can’t figure out the windows switching shortcut keys there. (This is from memory since I’m not on OSX right now) Command-Tab switches between Applications, but not separate instances of applications. Anyone know the shortcut key for that one or if there is a separate key combo to mimic Windows or Gnome?