https://www.icy-veins.com/d3/barbarian-leveling-build-guide
https://www.icy-veins.com/d3/barbarian-leveling-and-fresh-70-guide

Helm: Flawless Royal Diamond (or highest available for CDR) or Flawless Royal Amethyst (or highest available for Toughness)
Torso and Pants: Flawless Royal Ruby (or highest available)
Weapon: Flawless Royal Emerald (or highest available)

• Bane of the Trapped — staple multiplicative damage increase. Note that the gem is self sufficient, proccing itself when fighting in melee range, where the Barbarian fights almost by default.
• Bane of the Stricken — almost mandatory gem for Greater Rift progression, as it is designed to whittle down the scaling health numbers of monsters with a percentage-based increase on successive attacks.
• Boon of the Hoarder — synergizing with other farming mainstays like Avarice Band and Goldwrap, this gem will not only keep you rich, but also sped up and safe during normal rift farming.
• Bane of the Powerful — the speedfarm counterpart to Bane of the Stricken, Bane of the Powerful offers a solid overall damage and survivability increase as long as your killing speed does not fall behind the timer of the gem.

Situational gems

• Esoteric Alteration is a defensive cornerstone in facetanking builds, protecting you against bursty elemental affixes.
• Simplicity's Strength amplifies primary skill damage, which is particularly useful for a Frenzy build.
• Taeguk is a great addition to a channeler Barb, which you will be by using anything Whirlwind-related.

Kanai's Cube choices are highly build- and content-specific, making them hard to summarize. Generally speaking, Barbarians should store the powers of the following items in the Cube as soon as they have the materials available:
x The Furnace
x In-geom
x Messerschmidt's Reaver
x Oathkeeper
Ambo's Pride
x Fjord Cutter
x Blade of the Tribes
x The Gavel of Judgment
Fury of the Vanished Peak
Bastion's Revered
Standoff
The Three Hundredth Spear

x Pride of Cassius
x Dread Iron
x Girdle of Giants
x Lamentation
x Vile Ward
Mortick's Brace
x Bracers of Destruction
Bracers of the First Men
x Skular's Salvation
x Vambraces of Sescheron
Lut Socks
x Aquila Cuirass
x Nemesis Bracers

x Band of Might
Obsidian Ring of the Zodiac
x Ring of Royal Grandeur
x Convention of Elements
x Avarice Band

Core
Movement Speed up to 25% cap
Strength
Vitality
Maximum Fury (depends on build)

Offense
Critical Hit Chance
Critical Hit Damage
Cooldown Reduction
Attack Speed

Defense
All Resistance
Life %
Armor
Life Regeneration

Utility
Area Damage
Resource Cost Reduction
Life on Hit
Globe Radius

https://www.icy-veins.com/d3/whirlwind-gr-wastes-barbarian-bis-gear-gems-paragon-points
https://www.icy-veins.com/d3/barbarian-whirlwind-gr-build-with-wrath-of-the-wastes