Skills
From Eco - English Wiki
Professions
Professions are the general areas of expertise players can focus on within Eco. Inside a Profession, the player can choose among several Specialties. Professions help players coordinate their efforts by offering a basic structure for the various roles in the game.
Skill Points are not needed to unlock professions. They are all unlocked from the start and there is no penalty for selecting specialties of different professions.