This user guide covers all of Spine's features and what they do. Everything is explained, from the most basic features to the most advanced, and topics are introduced in order, so the articles can be read from beginning to end.
Many articles include a video which covers the same information as the text, allowing you to see firsthand how things work in Spine. You may also browse the Spine User Guide videos on YouTube.
While this user guide explains how Spine works and what everything does, the Animating with Spine videos teach how to use Spine to make great animation. Also see the Spine example projects which explain the rigging in detail.