Butternut gets peeled, red kuri does not: its skin is eaten once cooked. Both get cut in half, emptied with a spoon, and go in the oven as wedges or into a soup as dice. A squash is hard: you steady it before cutting.
Heavy, with no soft spots, with a dry stem.
Cut a slice off the base to get a flat side and stand the squash on it, it will not roll. Cut in half with a big knife, without forcing in one go. Remove the seeds and strings with a spoon. For butternut, peel with a peeler or a knife; for red kuri, keep the skin.
Five minutes for a butternut.
Whole, out of the fridge, cool and dark, one to three months. Cut, the cut side under film, in the fridge, a week.
The page "Blended soup": red kuri squash, onion, a little cream.
A squash is hard and round, the knife can slip. A flat side against the board, the holding hand far from the blade, and you cut in several goes rather than forcing.
Very easy