This isn't a blanket endorsement of the course, but the one article I looked at, Week 44: Choose a voice, offered some very sensible advice to new writers:
The problem with using multiple narrators is that there is always a risk your reader will prefer one to the other.
I would also advise against mixing the first and the third person in the same book.
Many authors do or have done (mea culpa), but I now regard it as a sign of insecurity, suspecting that the author couldn't cope with the limitations of one style and so decided to mix them up, hoping it would look postmodern.
There has to be a cast-iron reason for that kind of stuff otherwise you won't get away with it. Readers aren't fools.
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