Like biting, chewing is a natural canine behaviour, especially for young puppies whose adult teeth are still coming through. Don’t aim to prevent them from chewing altogether. Instead, provide them with lots of toys they can chew, and make sure anything you don’t want them to chew - items of clothing, children’s toys, dangerous household chemicals etc. - is stored well out of their reach.
Your puppy may chew your furniture or TV cables too - things which are a bit harder to keep out of their way. To avoid this, aim to supervise your new pup at all times. If they try to chew something they shouldn’t, get their attention and ask them to do something. It could be to come to you, to sit down, or to play with a toy, etc.
Once they’ve performed the command successfully, reward their behaviour with a treat, with a toy (that they can chew) or with a little bout of playtime. You could also use play, treats or toys to divert their attention away. Whatever you do, don’t chase your pup – they’ll think you’re playing with them.