Hey @DiegoQuarantine!
AFAIK there is no specific tutorial for VFXGraph yet, except the few really basic ones. Most of the information about this tool can be found on the unity forum thread, and example projects by Unity. Also check out @keijiro on twitter and his github page. Also you can join to the official unity discord, to ask some questions in the “VFX” channel, the community there is pretty active there.
Links:
https://forum.unity.com/threads/feedback-wanted-visual-effect-graph.572110/
https://github.com/Unity-Technologies/ScriptableRenderPipeline/wiki/Visual-Effect-Graph