SlicerRT Tutorials

Greetings! Where can I find step-by-step tutorial for using of SlicerRT? From segmentations and beam creating to dose visualization in 3D? I’ve found some tutorials on your main site, but I’d like to find more. Thank you!
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I suggest checking out the Tutorials list on the SlicerRT page
https://www.slicer.org/wiki/Documentation/Nightly/Extensions/SlicerRT#Tutorials

In your case the most useful would probably be the External beam planning tutorial.