This documentation covers the most important aspects of the Web API, but for in-depth tutorials, guides and reference, Spotify’s own resources are strongly recommended.
App Settings - walkthrough of creating and configuring an application
Authorisation Guide - detailed view of authorisation methods
Web API Reference - reference documentation of all endpoints
Track Relinking Guide - about track availability within markets and how tracks are relinked to user markets
Working With Playlists - playlist semantics and properties