Can a client legally refuse to pay a freelancer after work is done?

[Btaliat]

It is not legally right for the clients not to pay the freelancers after the completion of the tasks. However, that doesn't mean there are not some clients that will breach these contracts and refuse to pay the freelancers despite the fact that the freelancers have done their parts. That's why it is always better for the freelancers to know more about how to set up their contract to protect themselves. What do you think about this.