In wasteland2570, there are five categories of mundane skill classes with five skills (talents) each: Crafting, Knowledge, Physical Skills, Social Talents, and Survival Skills. These are the basic skills that will represent the strengths of your character.
Magic works a bit different. You will a short introduction if you check out the Magic Skills subdivided into five different representations.
On your character sheet, you will find additional space for your Specialised Skills. Once you have gained a foothold in the RPG world of wasteland2570, these will allow further character development.
Read about Skill Checks.