For example in this sentence:
And don't worry if you've never played the sport. That experience might help, but it's not necessary. As long as you know the rules and can do the job, you can be a referee!
Can "provided" ,or "supposing" also be used to take place of "if"?
Are “if”,“provided”, and “supposing” interchangeable in such conditional sentences? Are there any rule about using them?
Detailed explanation would be appreciated.