I expect this to be an evolving list. At this point, this is based on 17 days of (direct, hands on!) experience.
Not to dither about, here's a list of things I've noticed thus far:
Cloud strewn skies are far more elegant and colorful than clear days.
A full cloud cover makes for very dull photos.
Getting the timing right is hard. Sunsets are more beautiful after the sun dips below the horizon. Sunrises I'm still exploring*, though intuitively I'd expect them also to be more interesting pre-horizon.
There isn't a single moment of a sunrise or sunset. They're constantly evolving.
That being said, there's definitely a point when they're over, and it's obvious.
The best way to describe it is as a crescendo and diminuendo, with intensity of color being the sliding scale.
Finding a good angle on or clear unobstructed view of the horizon is difficult where I live. Especially sunrises.
Sun events are too big to fit into one frame. They involve the whole sky.
Capturing the whole thing is not the point.
Sometimes the other horizon is more interesting than the one with the sun.
*I tend to wake up as its rising, and catch it after.