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IdP (Identity Provider): A web-based system that can authenticate a user on behalf of another system called a SP (for Service Provider).

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Among other things, The SP must be configured to specify which of these attributes should be passed to the shrine code (in the form of HTTP servlet request attributes and/or headers).

Shibboleth config Documentation

This is not required reading, but if you want to jump in depth, this is the official Shibboleth configuration documentation

https://shibboleth.atlassian.net/wiki/spaces/SP3/pages/2065335529/GettingStarted

Developer tools

• SAML : "SAML DevTools extension" for Chrome. These tools let you view encoded SAML content. 

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