My puppy cries at night—what should I do?

The first few nights of a new puppy coming home are going to be the hardest. I'll tell you that right now. Unless you have an exceptional dog, the first four nights are usually a living hell. Let's just be honest. I am a big fan of kennel or crate training. 
And for me, what that looks like is when I go to bed, I'm the last one to go to bed at my house, so I stay with the dog. I take them outside. And the last thing before it's lights out is I put them in the kennel. I personally do not put food and water overnight. I'm not eating at night when I'm sleeping, nor do they need to eat at night when they're sleeping. It just makes a mess. So I put them in there with no food or water. I'll put a nice bed in there for them. And if I really am kind of worried about how they're going to behave, I might even cover it with a blanket, so it stays nice and dark and cozy in there for them.
It's kind of like raising a child. There are people that will wake up every time the child goes, ""Eh,"" and run to them and pick them up to take them to their bed. You can do that with a dog too, but you're going to be creating a monster. So I normally will kind of let them cry it out within reason, but I will let them do that the first couple of nights. If you stick to your guns, trust me, they will figure it out. The kennel becomes a comfort zone for them. It's just those first few nights. They're away from home. They're away from their mother, their siblings. They're not sure what's happening. I get it. But if you do give in and put them in bed with you, that's fine, but you better get ready to do that for the next 15 years or so.

Puppies are a lot like babies. They're going to cry at night. And so that's, unfortunately, part of the responsibilities that do come along with a puppy. You want to figure out what they want—are they hungry? Do they need to go out and potty? Or are they just lonely? A lot of puppies come from a litter situation. They have been around their littermates, so this may be the first time they're alone. You need to replace that with a giant stuffed animal or having them in the room with you, something to make them feel more comfortable.