In the US it depends on the size of the trailer. If your hauling any trailer with a big rig (semi) you need a CDL license but anything smaller with a regular car or truck a regular standard drivers license is ok as long as your trailers plates are up to date and your lights work .
I live in ca and the only license u need is your normal ID
In Australia I’m pretty sure to be able to tow anything you need your full blacks I’ve got my red P’s and I got pulled over
In the states just a normal drivers license
In Canada you can tow a trailer with any drivers license as long you follow the rest of the laws that go with that license.