Here are some links which helps to understand LabVIEW Actor Framework.
https://labviewwiki.org/wiki/Actor_Framework
https://labviewwiki.org/wiki/Actor_Framework_is_not_as_hard_as_you_think_and_here_is_why%E2%80%A6
https://www.ni.com/documentation/en/labview-comms/5.0/prog-pattern/actorframe/
https://forums.ni.com/t5/LabVIEW/Actor-Framework-for-Dummies/td-p/3637691?profile.language=en
https://labvolution.com/labview-actor-framework-basics/
https://www.mooregoodideas.com/actor-framework/basics/AF-basics-part-1/
https://www.bloomy.com/support/blog/getting-started-actor-framework-part-i