Understand the problem
Start with the question a technology or policy answers, the people and systems involved, and the trust between them.
Learn how identity works, one step at a time. Real explanations, diagrams you can follow, and a lab where you try each idea.




Identity is more than just a login. The lessons form a library in one section. Open any lesson in any order: each one shows where it sits and which lessons it builds on.
Start with the question a technology or policy answers, the people and systems involved, and the trust between them.
Follow a protocol exchange, inspect a credential, or trace an access decision. Connect each step to the concept behind it.
Work through examples, change a configuration, and investigate failures. Learn how to implement something and why it behaves the way it does.
Sections hold chapters, and chapters hold lessons. Every lesson shows its place in the line under its title, and the sidebar shows the rest.
12 lessons in 1 chapters
Follow a protocol exchange, inspect a credential, or trace an access decision. Diagrams follow standard notation and link back to the lesson that explains them.
Investigate fictional applications, exploit deliberate identity mistakes, then repair and retest them.


Every lesson has a lab, 12 in all. You work in your own lab tenant, an identity service with its own users, clients and Audit, and each step you finish appears in the lab's activity as you go.
Small tools for the everyday work of identity: reading tokens, building requests, checking metadata, certificates, provisioning messages and policies.


The overview explains who the lessons are for and how each one works. Reading the lessons needs no account.