Blade Flurry Build - Juggernaut(Standard)

Having easy generation and upkeep of Endurance Charges early in the league means you have free resistances and physical damage mitigation if you stacked them from the tree.
This allows for much easier gearing for new players, specially at the start of a new league when there isn't much currency.
It also comes with buffed Fortify which directly reduces any damage type when hit.
Not being affected by slow means you can save on rolling over maps that have slowing effects like chilled ground and temporal chains.

Ascendancy Order:
1 - Unflinching [Charge generation when hit, and +1 Max End. Charge]
2 - Unrelenting [Charge sustain and damage mitigation]
3 - Unstoppable [Cannot be slowed]
4 - Unyielding [Improves Fortify]

Tree Leveling Progression:

While these will guide you in which direction to go on the tree, you must always remember that the tree mainly boosts stats from gear. Having an acceptable weapon to scale the damage while leveling is important.

If you feel like your maximum life is still low even though you've followed the tree, maybe consider looking for better life rolls from dropped pieces, or simply buying one or two pieces with fair life rolls early on so it helps in the long run.

Bandit Pick:
When you reach act 2 you need to pick a single bonus from 3 different bandits, or to slay them all for an extra skill point on the tree.
I recommend to follow Oak, as he gives 20% Increased Physical Damage, 1% Life Regeneration and 2% Physical Damage Reduction.

Passive Tree: Leveling Skill Trees

Skills/Gems/Links:  

Gems are pretty straight forward to follow: 

                
All level 20, except for Cast When Damage Taken + Tempest Shield.                   
Green gems are pretty must a must have while leveling, so work your sockets out when you swap gear.                   
Red gems can be left out, but get them socketed before you start maps.                    
Remember that the highest stat requirements of a piece of gear tell you what colors it will roll more often when you use a Chromatic Orb on them. This will prevent you from running out of them and getting your gems socketed faster. (STR=Red/INT=Blue /DEX=Green)

Main hand: Herald of Ash + Hatred + Stone Golem       
Off-hand: Vengeance + Curse on Hit + Enfeeble       
Helmet: Ancestral Warchief + Maim + Melee Physical Damage + Concentrated Effect      
Chest: Blade Flurry + Chance to Bleed + Ruthless + Melee Physical Damage + Faster Attacks + (Concentrated Effect)       
Gloves: Shield Charge/Leap Slam + Fortify + Faster Attacks + Blood Magic       

Boots: Cast When Damage Taken + Tempest Shield / Blood Rage + Increased Duration   

Main Attack - Blade Flurry:

5/6L=> Blade Flurry > Chance to Bleed > Melee Physical Damage > Ruthless > Faster Attacks > (Concentraded Effect)

Deals physical damage that allows you to get extra damage from Herald of Ash and Hatred.           
Blade Flurry is a very nice all in one skill where it can be used for both single target and pack clearing very effectively.
Remember to let go of it when you reach 6 charges, rinse and repeat. You'll see the DPS difference yourself when you go up against tankier bosses.
Making use of the charges damage every few seconds will also help you manage your mana cost better.

Augmenting Skills - Ancestral Warchief:

4L=> Ascenstral Warchief > Maim > Melee Physical Damage > Concentraded Effect

Your totem sidekick is there for 3 reasons:
It hits things for added DPS;
It gives you a MORE melee damage multiplier when active;
It applies Maim to enemies.
Maim will cause enemies hit to take increased physical damage from all sources, so having the totem up and slapping things around will help with a few tankier bosses.

Auras/Buffs:

Herald of Ash - Converts a % of physical damage into extra fire damage [Reserves 25% mana]

Hatred - Converts a % of physical damage into extra cold damage [Reserves 50% mana]
These together will reserve 75% of your maximum mana for a large boost in damage
Tempest Shield + Cast When Damage Taken            
Your main reason to use tempest shield will be for the 3% Chance To Block that it provides.
As for gem levels, I personally like having to have my CWDT gem activate after around 1/3 of my total health being taken from hits.

Blood Rage

Activating Blood Rage will provide you with a temporary boost in Attack Speed, Physical Attack Life Leech and gives a 25% chance to grant a Frenzy Charge on kill.

While active, it'll drain 4% of your life per second as physical damage. Your Endurance Charges together with a Stone Golem will mitigate this damage, allowing for some positive regeneration.
It also resets the timer on kill, so it's convenient to quickly move from pack to pack to keep Blood Rage active.

Movement

4L=> Shield Charge/Leap Slam > Fortify > Faster Attacks > Blood Magic

Your movement skill is how you will be applying the Fortify effect. It's on a timer same as Blood Rage, but it doesn't reset on kill, so you'll have to reapply every few seconds.

Pick a movement skill between Leap Slam and Shield Charge (one can jump over ledges, and the other moves faster in linear maps)

Recommended Gears:

You're not using Vaal Pact, so getting physical instead of global leech will be sufficient to regenerate life without having to worry about wasting extra leech. Blood rage will provide you with some life leech but you don't want to lose that bonus if the timer runs out.
Remember when gearing to get a decent roll in both Physical Life and Mana Leech in any of your pieces. Gloves and jewelry can roll them.
As mentioned in the leveling progress, also get a jewel with +2 Mana gained on hit and you're good to go.

Weapon:

You're using a one-handed weapon since you'll be wielding a shield, so it doesn't have a lot of base physical damage.

The tree compensates this damage since the Ascendancy is where most of your defenses are coming from.
Using Resolute Technique allows you to ignore accuracy and crit rolls on gear, this makes it rather cheap to buy a high physical DPS weapon every few levels.

Low Tier Unique Mapping Weapon: Ichimonji

This sword has an acceptable base physical damage and comes with a very unique roll, Increased Effect of Buffs on You.        

That roll will push the effects of Herald of Ash and Hatred, giving you more extra total DPS.        
It'll allow you to enter maps and have enough DPS to start clearing through the atlas.    

Mid Tier Rare Mapping Weapon:

If your damage starts falling while you're using Ichimonji, you can invest some currency into a high Physical DPS one-handed sword.        

Since you're using Resolute Technique it's much easier to shop around for a decent weapon, ignore the crit on weapons and get as much physical damage per second as possible.        

High Tier Unique Mapping Weapon: Varunastra    

With a slight change in the passive tree a Varunastra can help pushing damage numbers a lot higher due to the hybrid bonuses it receives.        

It also lets us replace the one jewel with +2 mana on hit from our tree for even better min-maxing of gear.        

Shield:

While there are a large amount of unique shields to play around with, some times a simple yellow rare can go a long way, in 3.0 shields got a whole lot of new rare mods that they roll.                    

Low Tier Map Entry:

Look for a rare shield that has a large amount of life, fair armor, and as much resist as you can afford on it.            

The Unique More Expensive Option: The Surrender

If you have extra currency after some time into the league and feel like staying safer, there's always the option of The Surrender as it returns 250 life on block, on top of being a good shield base. It doesn't have resists, so you'll need to shift those into better rare gear elsewhere.

Chest:    

While your Juggernaut Ascendancy will provide you with easy layer of resists/defense, the passive tree will provide a fair sum of increase life %.                   

You now need to get flat # life on your gear to make use of it. While leveling make life and at least one resist your priority rolls when putting on new pieces of gear, ideally on item bases that help with getting the socket colors you need.                    

Belt:

Belt of The Deceiver Increased damage dealt, increased life, increased resistances and reduced damage taken from critical strikes.                

This is a great overall belt that also pairs very well with Indomitable from the passive tree, stacking the reduced damage taken from critical strikes all the way to -50%.              

Rings:

Endurance charges will give you a lot of resistances, but those are not always up when you start a fight, it's important to make sure your base resists are capped too                        

Map Entry Rings: Ring slots have the option of Two-Stone Rings. They have a double resistance implicit as a base and can make it easier to gear up until you can afford higher tier rolls of resists throughout the rest of your gear.                
 Use the ring slots to push your resists up as much as you can, try obtain a roll of life on them, even if not very high.                
Plain Better Rings: As you get better rolls on your other pieces of gear with higher resistances, you can then start replacing them with rings that have offensive rolls instead.                
A good base is a Steel Ring, as it gives Implicit added # Physical Damage To Attacks, instead of just resistances.                

Amulet:

I personally like keeping the amulet as a free filler slot for stat requirements while leveling. Prevents having your build break in case you can't replace you other items and are locked out of them.                        

Doing so also let's us swap amulets for different purposes, so take your pick                        
Rare Amulet: You probably already have enough resists from the rest of your gear, you can prioritize offensive rolls.                
Look for # Flat Physical Damage + Attack Speed + Life as priority stats.                
Situational Unique Amulets:                        
Stone of Lazhwar Defensive Option, if you know you're about to face a certain boss that uses mainly spells this amulet will help mitigate the damage received for that fight. Works great when paired with Rumi's Concussion.            
Bisco's Collar Farming Option, while you're busy grinding for XP you'll often find that you won't need the extra damage or defense from the above two. Bisco's will help you farm that currency up for you to get much better rolls on your gear.            

Flasks:

Besides some flasks giving life, there are also a lot of other flasks that give very nice temporary bonuses.                        

Saving flask charges for rares and boss fights is ideal for both offensive and defensive reasons.                        
                            

Budget League Starter Flask Setup

                1- Life             

                2- Basalt(Gives 20% Physical Damage Reduction, roll Increased % of Armor)             
                3- Granite (Gives 3000 armor during effect, to be replaced by rumi's)            
                4- Atziri's Promise (% of Physical Damage as Extra Chaos Damage + Chaos Resistance)            
                5- QuickSilver (Quick boost in movement speed, roll Immunity to Bleed)            
                            

End-Game Flask Setup

            1- Blood of the Karui (Fills life to maximum at end of flask effect)                 

            2- Taste of Hate (% of Physical Damage as Extra Cold Damage, and cold mitigation in one flask)                
            3- Rumi's Concussion (Gives 3000 armor together with chance to block both attacks and spells)                
            4- Atziri's Promise (% of Physical Damage as Extra Chaos Damage + Chaos Resistance)                
            5- QuickSilver (Quick boost in movement speed, roll Immunity to Bleed)                
                            
      OR 3- Instead of Rumi's Concussion grab Lion's Roar for a more offensive option.                
            4- If you got some chaos resistance on gear, use Sin's Rebirth instead of Atziri's Promise