on Jane Friedman site:

For most writers, first- and second-person POVs are fairly straightforward (though in the point-of-view family, second might be the eccentric uncle no one quite knows how to engage with).

But third-person can be the family troublemaker, so sensitive and mercurial with all its facets: third-person omniscient, third-person limited, deep third-person. (And don’t even get me started on objective third-person—that guy! Living off the grid somewhere in Montana…)

Yet besides chummy, easygoing first-person, third-person POV dominates the current publishing market, so it’s helpful, as with any difficult family member, to learn to navigate its many moods. And the two biggest bugaboos are uncertain POV and slipping POV.