I have onecnc xr2, I need some how to books. The one that comes with the software ain't the best.
Here is a link to the ONECNC Blog. It has a lot of information and videos.
If you visit the ONECNC users form you will also find other videos and information. Go there "ASK A QUESTION" and stand back. You answer will usually come really quick.
Just some ideas that may be helpful.