YouTube user Allieway Audio has started posting a series of great tutorials and introductory videos for Orca:
https://www.youtube.com/watch?v=RaI_TuISSJE
https://www.youtube.com/watch?v=CR1TMGYhCoE
To give a bit of context the primary creator of this project has been essentially living off a sailboat for the past few years and has traveled some 28000km around the world in the process. More info at their site at https://100r.co/ :)