PlayerEvents.loggedIn((event) => {
  // Check if player doesn't have "starting_items" stage yet
  if (!event.player.stages.has('starting_items')) {
    // Add the stage
    event.player.stages.add('starting_items');
    // Give some items to player
    event.player.give('ftbquests:book');
    event.player.give('farmersdelight:flint_knife');
    event.player.give('minecraft:bread');
  }
});
