Your survivor's core stats are Health, Stamina, Hunger, and Thirst. Health determines how much damage you can take, Stamina governs your ability to sprint, attack, and dodge, while Hunger and Thirst are your primary survival meters. As you gain Kuban Energy from defeating enemies and completing missions, you can spend it at the Kuban Energy Converter in your base to increase your character's level and unlock skill points.
Each level up grants you skill points that can be invested in various skill trees. These trees include Melee, Ranged, Survival, and Support. Prioritize skills that complement your chosen playstyle. For example, if you prefer stealth, invest in skills that reduce noise or improve critical hit chances with silenced weapons. If you're a frontline fighter, focus on health, stamina, and melee damage. Regularly check your skill tree and plan your progression to optimize your survivor's capabilities.