There is some truth to this, but my goodness a new pup is supposed to be exciting.
Here would be my condensed version:
Feed very young pups often.
Keep Nutrical on hand.
Keep an ER vet number close.
Let puppy sleep when they want to.
Don't let him/her play for extended periods.
No walking until two weeks after last puppy shots.
Use caution when allowing anybody to handle your puppy.
It's mostly just common sense. Relax and enjoy it.