Every skill attempted will roll against the difficulty level determined by GM at the Player Level. (Level 1 players roll against the Level 1 Skill Table)
Attempting a skill without any skill points in that category will always be at -1 (Formidible tasks will be impossible)
Each Skill Category has 6 levels (1-6). Gaining a skill provide bonus to skill check rolls equal to the level (Level 1 skill = +1 modifier, etc)

Characters cannot learn a skill level higher than their player lever (Level 1 PC cannot learn Level 2, 3, 4,5,6 skill)
Level Zero is an exception as they are learning new skills at Skill Level 1 and gain the +1 bonus modifer)

Skill Check Level Zero (1d4)

1-2 || Easy
3 || Moderate
4 || Complicated
5 || Formidible

Skill Check Level 1 (1d6)

1-2 || Easy
3-4 || Moderate
5-6 || Complicated
7 + || Formidible

Skill Check Level 2 (1d6)

1-3 || Easy
4-6 || Moderate
7 || Complicated
8 || Formidible

Skill Categories

1 || Academic Skill: 
Science, Law, History, Literature, etc

2 || Agility Skill:
Dexterity, balance, precision movements, etc

3 || Animal Skill: 
Riding, Training, Handling, Veterinary, Rehabilitation, etc

4 || Alchemy Skill:
Making Potions, Rations, etc which restore energy (Nature pre-req)

5 || Arcane Skill:
Attunement, scrolls, magic lore, etc (Academic Pre-req)

6 || Awareness Skill: 
Investigation, Perception, Insight, Supernatural, etc

7 || Crafting Skill: 
Blacksmithing, jewelry, clothing, woodworking, etc

8 || Larceny Skill: 
Sneaking, Pickpocketing, Lock picking, Disguise, etc (Agility Pre-req)

9 || Medicine Skill: 
First-Aid, Diagnosis, Surgery, Rehabilitation, etc.

10 || Nature Skill: 
Survival, Hunting, Navigation, Tracking, Herbalism, etc

11 || Physique Skill: 
Athletics, Running, Jumping, Swimming, Brawling, Riding, etc

12 || Religion Skill:
Lore Knowledge about deities, rites and prayers, religious hierarchies, holy symbols, and the practices of secret cults, etc

13 || Seafaring Skill: 
Sailing, Boating, Navigation at sea, etc

14 || Social Skill: 
Persuasion, Intimidation, Performance, etc

15 || Stamina Skill:
Endurance, fortitude, resistance, constitution, etc