Minecraft wiki entry for Entity_format, associated text: : The entity's root tag.
 Offhand: The item being held in the mob's off hand.
: The item.
 Inventory: Each compound tag in this list is an item in the player's inventory.
: An item in the inventory, including the slot tag.
 Slot: The slot the item is in.
Tags common to item stack[show]
 format_version: The format version of this NBT.
 SelectedInventorySlot: The selected inventory slot of the player.
 SelectedContainerId: Unknown.
 Sleeping: True if the player is sleeping
 SleepTimer: The number of ticks the player had been in bed. 0 when the player is not sleeping. In bed, increases up to 100, then stops. Skips the night after all players in bed have reached 100. When getting out of bed, instantly changes to 100 and then increases for another 9 ticks (up to 109) before returning to 0.[needs testing]
 SpawnBlockPositionX: The X coordinate of the player's spawn block.
 SpawnBlockPositionY: The Y coordinate of the player's spawn block.
 SpawnBlockPositionZ: The Z coordinate of the player's spawn block.
 SpawnDimension: The dimension of the player's spawn point.
 SpawnX: The X coordinate of the player's spawn point.
 SpawnY: The Y coordinate of the player's spawn point.
 SpawnZ: The Z coordinate of the player's spawn point.
 EnchantmentSeed: The seed used for the next enchantment in enchantment tables.
 RideID: The Unique ID of the entity that the player is riding.
 LeftShoulderRiderID: The Unique ID of the entity that is on the player's left shoulder.
 RightShoulderRiderID: The Unique ID of the entity that is on the player's right shoulder.
 PlayerGameMode: The game mode of the player.
 PlayerLevel: The level shown on the XP bar.
 PlayerLevelProgress: The progress/percent across the XP bar to the next level.
 DimensionId: The ID of the dimension the player is in.
 EnderChestInventory: Each compound tag in this list is an item in the player's 27-slot ender chest inventory.
: An item in the inventory.
 Slot: The slot the item is in.
Tags common to item stack[show]
 HasSeenCredits: True if the player has traveled to the Overworld via an End portal.
 PlayerUIItems: Unknown
: An item in the UI, including the slot tag.
 Slot: The slot the item is in.
Tags common to item stack[show]
 MapIndex: Unknown.
 Sneaking: True if the player is sneaking.
 AgentID: The Unique ID of the player's agent.
Tags common to abilities[show]