Sam Nadol

“1 Speed=Increases Speed 2 Slowness=Increases Slowness 3 Haste=Increases Mining Speed 4 Mining Fatigue=Makes Mining Slower 5 Strength Increases Player Strength 6 Instant Health=Gives Player Instant Health 7 Instant Damage=Gives Player Instant Damage 8 Jump Boost=Gives Player Jump Boost 9 Nausea=Makes Player Screen Blurry 10 Regeneration=Regenerates Player's Health 11 Resistance=Makes Player Resistant 12 Fire Resistance=Makes Player Resistant To Fire 13 Water Breathing=Longer breathing in water 14 Invisibility=Makes player invisible 15 Blindness=Blinds Player 16 Night Vision=Helps Player see at night 17 Hunger=Gives the Player a hunger effect 18 Weakness=Makes Player weak 19 Poison=Poisons Player 20 Wither=Effect Varies 21 Health Boost=Adds more hearts to your health bar”
― Sam Nadol, Minecraft: command handbook for beginners: An unofficial guide