In this video, I show you 28 of Minecraft's current list of secret items. These are items that can neither be obtained through natural means in survival, creative mode and even glitches/exploits. They can only be obtained through commands. In other words, these secret Minecraft items are "command only" items.
The commands and the custom item generators are listed below!

Generators:
Custom Potions/Tipped Arrows: https://minecraft.tools/en/potion.php
Custom Enchanted Books: https://www.digminecraft.com/generato...
Custom Written Books: https://minecraft.tools/en/book.php
Custom Player Heads: https://minecraft-heads.com/custom-he...

Commands:

Bundle: /give @p minecraft:bundle
Fire Painting:/give @p painting{EntityTag:{variant:"fire"}}
Wind Painting: /give @p painting{EntityTag:{variant:"wind"}}
Water Painting: /give @p painting{EntityTag:{variant:"water"}}
Earth Painting: /give @p painting{EntityTag:{variant:"earth"}}
Ender Dragon Spawn Egg: /give @p minecraft:ender_dragon_spawn_egg
Wither Spawn Egg: /give @p minecraft:wither_spawn_egg
Player Head: /give @p minecraft:player_head{SkullOwner:"PlayerName"}
Light Block: /give @p minecraft:light
Command Block - /give @p minecraft:command_block
Chain Command Block - /give @p minecraft:chain_command_block
Repeating Command Block - /give @p minecraft:repeating_command_block
Command Block In a Minecart - /give @p minecraft:command_block_minecart
Barrier - /give @p minecraft:barrier
Jigsaw - /give @p minecraft:jigsaw
Structure Block - /give @p minecraft:structure_block
Structure Void - /give @p minecraft:structure_void
Debug Stick - /give @p minecraft:debug_stick
Knowledge Book - /give @p minecraft:knowledge_book
Uncraftable Tipped Arrow - /give @p minecraft:tipped_arrow
Uncraftable Potion - /give @p minecraft:potion
Uncraftable Splash Potion - /give @p minecraft:splash_potion
Uncraftable Lingering Potion - /give @p minecraft:lingering_potion
Uncraftable Suspicious Stew: /give @p minecraft:suspicious_stew
Enchanted Book - /give @p minecraft:enchanted_book
Written Book - /give @p minecraft:written_book
Empty Map: /give @p minecraft:empty_map
Petrified Oak Slab: /give @p minecraft:petrified_oak_slab

This video is about the 28 items that you probably didn't know existed! Sort of like Minecraft things you didn't know existed, but ITEM VERSION! Similar to Minecraft facts you didn't know about, and Minecraft things you should start doing!