The ideal scenario for a graphic resource would be to have a board with everything a new user of Miro needs in order to get started. For example, I often invite people who have never used Miro to my boards when launching a project, and I wonder if a board like "everything you want to know about Miro" would be really helpful.
Userlevel 7
+12
https://miro.com/miroverse/participant-onboarding-playground/
There is also this template that I made (but needs updating to reflect the new UI that is rolling out):
https://miro.com/miroverse/getting-to-know-miro/
Miro Academy
There are also a number of short, free courses that you can refer your participants to, e.g.:
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