Improve Your Game
Basic skills:
The Ultimate Handbook for Beginners
Ultimate Frisbee Skills & Strategies
Intermediate skills:
The Ultimate Handbook
Advanced skills:
The Huddle
Understanding Ultimate
Throwing exercises:
The Wiggins Zen Throwing Routine
Kung Fu Throwing Routine
Drills:
USA Ultimate Skill Development
The Ultimate Skills and Drills
Video:
Throwing & Handling Skills, Field Strategy
Brodie Smith Youtube channel (search for the ‘how to’ videos on his channel)
eBooks:
Rules Ultimate Frisbee 2017 English
Forum:
Ultitalk