This guide is kinda broken since the CSS update. I might fix it one day.

Armor

Netherite Helmet
Protection IV
Respiration III
Aqua Affinity
Thorns III
Unbreaking III
Mending

When on Head:
+3 Armor
+3 Armor Toughness
+1 Knockback Resistance
+3 Oxygen Bonus
+400% Submerged Mining Speed

Netherite Chestplate
Protection IV
Thorns III
Unbreaking III
Mending

When on Chest:
+8 Armor
+3 Armor Toughness
+1 Knockback Resistance

Netherite Leggings
Protection IV
Swift Sneak III
Thorns III
Unbreaking III
Mending

When on Legs:
+6 Armor
+3 Armor Toughness
+1 Knockback Resistance
+0.45 Sneaking Speed

Netherite Boots
Blast Protection IV note: Useful for those specific moments.
Feather Falling IV
Soul Speed III
Depth Strider III
Thorns III
Unbreaking III
Mending

When on Feet:
+3 Armor
+3 Armor Toughness
+1 Knockback Resistance
+1 Water Movement Efficiency

When worn:
+0.6 Explosion Knockback Resistance

Elytra
Unbreaking III
Mending

Shield
Unbreaking III
Mending

Enchant Guide

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Tools

Netherite Pickaxe
Fortune III
Efficiency V
Unbreaking III
Mending

When in Main Hand:
 6 Attack Damage
 1.2 Attack Speed
+26 Mining Efficiency

Netherite Shovel
Fortune II note: Fortune III will make gravel always drop flint and silk touch will make it always drop gravel blocks.
Efficiency V
Unbreaking III
Mending

When in Main Hand:
 6.5 Attack Damage
 1 Attack Speed
+26 Mining Efficiency

Netherite Axe
Sharpness V
Silk Touch
Efficiency V
Unbreaking III
Mending

When in Main Hand:
 10 Attack Damage
 1 Attack Speed
+26 Mining Efficiency

Weapons

Netherite Sword
Sharpness V
Sweeping Edge III
Fire Aspect II
Knockback II
Looting III
Unbreaking III
Mending

When in Main Hand:
 8 Attack Damage
 1.6 Attack Speed
+0.75 Sweeping Damage Ratio

Bow
Power V
Flame
Punch II
Unbreaking III
Mending

Crossbow
Quick Charge III
Multishot
Unbreaking III
Mending