After killing a certain number of players or doing jobs you level up, you gain a skill point to add on skills for certain weapons or jobs adding skills on the certain weapons (For example the shotgun) will allow you to buy skins and new shotguns. Adding skill points on jobs (For example farming) will allow you to get better crops. I know mining and woodcutting is a skill already but i think they should make more skills to make the game more like a RPG