You could try reading the BI help that can be found at the ? in the BI main windows, it explains just about everything in BI 6.
There is also a BI AI chatbot that does a good job of answering basic questions
The only major difference between v5 and v6 that I have seen is the built in AI which is still work in progress and is covered quite well by Bruce_H and several other great participants on the forums.
Moving from Blue Iris 5 to 6 there seems to be slight differences but I think I just need to use to it.
Thank you for the info and will take a look at these references.