Zergling Guide

Role
The Zergling is the fastest zero hero with the highest DPS. It excels in destroying lightly defended places with ease and attacking isolated miners. The Zergling for the most part should be thought of as a hit and run hero as it's low armor while being melee makes it vulnerable to mines, turrets, and sappers.

Skill Points and Items
As with all Zerg heroes, you should prioritize the first 4 skill points into claws for faster mining with 2 into mutation, for energy. You level up mutation further to 4, if no one on your team is using geysers.

Afterwards, it depends on your team.

Build Order 1
If your teammate is willing to upgrade items for you, you can focus on leveling claws to max, while having at least 5 carapace, and 3 mutation. Get a bit more mutation if you find yourself lacking energy, supply, or terrazine.

Build Order 2
If you don't have such a teammate, you should go 6 claws and 10 mutation to buy Jagged Claws, Thickened Carapace, and Energy Glands. This will allow you to buy level 3 claws and carapace for you and your teammates. With this setup, you may want to monopolize all vespene geyser as you'll be able to upgrade them to level 3. Afterwards, level up carapace to at least 5 for Ziggers.

The downside of going this route can means you wont be able to upgrade cloak early on along with being unable to buy stemcells, ziggers, and symbiote traps for some time.

However, the zergling is the least dependent on their carapace based ability than the other two zerg heroes

Ideal Setup
The ideal setup for items would be: 2 Level 3 claws of either type (To mine very fast and deal damage), Level 3 Thickened Carapace (Extra tankiness), and Level 3 Flexible Joints(More DPS and movement speed).

Strategy
Early on, mine as fast as you can constantly. Try to scout out areas that are lightly defended. This means killing Sapper's miners, Engineer's mules, or hit and running isolated mechanics while putting symbiote traps.

You can also take advantage of your speed to steal miners and metal that the miners haven't picked up. Also, use cloak to spread creep tumors with impunity, as most miners will not bother to spam flares.

It's important not to die during earthquakes because your damage output will be highest during that time. Dying during earthquake means a lot of money loss from mining time loss.

Later on in the game, you should try to coordinate with your team to attack as you alone are not very tanky. You might find yourself at a loss if miners start spamming minelayers everywhere. In that case, just focus on mining for money to build enough spawners for your team and spreading lava.