How can freelancers protect themselves from scams and unpaid work?

[Btaliat]

Despite the fact that there are some freelancing platforms that will protect the freelancers from falling victims of scam, it doesn't mean that they cannot be scammed. That's why it is better for the freelancers to protect themselves while working. Some people have suggested that freelancers should not work for clients except such a client is ready to pay up to 50% as upfront payments. Any client that refuses should not be attended to at all.