Are you a Command Block expert?

/summon Zombie {ArmorItems:[{id:diamond_boots},{id:diamond_leggings},{id:diamond_chestplate},{id:diamond_helmet}],HandItems:[{id:diamond_sword},{}],Health:100.0f}

/summon Zombie ~ ~ ~ {ArmorItems:[{id:diamond_helmet},{id:diamond_chestplate},{id:diamond_leggings},{id:diamond_boots}],HandItems:[{id:diamond_sword},{}],Attributes:[{Name:"generic.maxHealth",Base:100f}],Health:100.0f}

/summon Zombie ~ ~ ~ {Armor:[{id:diamond_boots},{id:diamond_leggings},{id:diamond_chestplate},{id:diamond_helmet}],Hands:[{id:diamond_sword},{}],Attributes:[{Name:"generic.maxHealth",Base:100f}]}

/summon EnderDragon ~ ~ ~ {DragonPhase:3}

/summon EnderDragon ~ ~ ~ {EnderCharge:1}

/summon EnderDragon ~ ~ ~

Use a Repeating Command Block

Use a Repeating Command Block set to Unconditional and Always Active

Spam click a lever next to the Command Block

{Breakable:0}

{ench:[{id:34,lvl:999999}]}

{Durability:-1}

/defaultgamemode

/me

/unban

A Command Block adjacent to it needs to be activated in order for it to be activated

The Command Block pointing towards it has to be activated for it to be activated

An entity has to fulfill certain specified properties in order for it to be activated

Nothing

Summoning a baby Zombie

Player-inflicted damage

Command damage

Fall damage

/give @p potion 1 16396 {SplashPotion:1,CustomPotionEffects:[{Id:7,Amplifier:10,Duration:0}]}

/give @p splash_potion 1 0 {Potion:harming,CustomPotionEffects:[{Id:7,Amplifier:9,Duration:1}]}

/give @p splash_potion 1 0 {Potion:harming,CustomPotionEffects:[{Id:7,Amplifier:9,Duration:0}]}

Oh hell no.

/msg @p Yeah!

Yeah!