Some information might be relevant to the 2018 Steam release because it's based on Global.
For information more relevant to the original Hellgate: London release and Test Center content, check out the London 2038 wiki.
Attributes
The characters attributes are divided into 4 categories also know as Feeds. These are Accuracy, Strength, Stamina, and Willpower. The amount of points in each attribute that you get to start with depends on which class you play and each time you increase a level you get 5 points to distribute how ever you wish.
Unlike some games where you can distribute the points purely to build your character, Hellgate Global has attribute requirements on everything you wear and equip as in Armor, Weapons, Mods etc. Due to this some players prefer to wait and not distribute their points each level, but to keep them in reserve until they are required to wear a new piece of Armor or use a new Weapon for example.
Once used the points can only be changed by using one of the Attribute Retrainers or Ability Initialization
Accuracy
For each additional point you gain a 2% bonus to critical damage with melee, ranged and magical attacks and a decrease in missile spread.
Enhancements which have a feed cost dependent upon this attribute: Crit chance, Increased Range, Depletion Reduction, Skill Boosting, Skill Rate Reduction, Weapon Accuracy
Strength
For each additional point you get 1% bonus to melee damage
Enhancements which have a feed cost dependent upon this attribute: On Hit/Kill, Skill Cost Reduction, Shield Penetration, Shield Overload, Splash Radius, Armor
Stamina
For each additional point you get +5 health
Enhancements which have a feed cost dependent upon this attribute: Attribute Boosting, Health, Regen
Willpower
For each additional point you get +2 Power points and an increase in your Power recharge rate.
Enhancements which have a feed cost dependent upon this attribute: Damage, Elemental Strength, Luck