Getting Started Guide - a good place to start if you are new to ZAP
Getting Further Guides - in depth guides covering different ways you can use ZAP
Desktop User Guide - the help included with the ZAP desktop application
ZAP Developer Guide - ZAP documentation for developers
Contributing Guide - lots more details on how you can get involved
FAQ - Frequently Asked Questions
ZAPping the OWASP Top 10 (2021) - a guide mapping Top 10 items to ZAP functionality that can assist IT security personnel
Automate - the various options for automating ZAP
Authentication Decision Tree - the best place to start if you need ZAP to authenticate to your app
Docker - detailed information on ZAP's Docker images
Burp to ZAP Feature Map - a mapping from Burp Suite features to their ZAP equivalents
Statistics - public ZAP usage statistics
Software Bill of Materials - ZAP add-on SBOMs
Alert Details - detailed information on the alerts ZAP can raise
Constants - defined in the ZAP codebase that are exposed via the API and/or scripts
Internal Events - detailed information on the internal events ZAP publishes
Internal Statistics - detailed information on the internal statistics ZAP maintains
Test Scans - the results of running ZAP vs well known deliberately vulnerable apps