the syro plugin is excellent in its functionality, but not well documented - I agree. Therefore, I think you will not find additional tutorials beyond what you already know.
As with most plugins, they are basically simple wrappers around the main library, so a good start to understanding the syro is the documentation with wide dimensions.
The next problem is to understand how Peter Ledbrook has compared broad functionality with Grails features. For me, the most important thing is that siro methods, such as SecurityUtils.subject.isPermitted , map to methods that you find in the scope. By modifying the realm file, you can perform almost all the tricks you need to perform (for example, get some permissions through LDAP).
If you could be more specific in what you need to talk about Syro in detail, perhaps I could give you a better answer :-)
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