Minecraft wiki entry for Useful_commands, associated text: 1 Invisible Item Frame ‌[Java Edition only]
2 Villager Trades
2.1 Profession and Types
2.2 Custom Name
2.3 Id and Count
2.4 Reward Experience and Max Uses
3 Replacing Blocks
4 Custom Enchantment Levels
4.1 Single Enchantment
4.2 Levels
4.3 Double Enchantments
5 Death Scoreboard
5.1 Create Scoreboard
5.2 Show Scoreboard
5.3 Delete Scoreboard