Freediving, unlike SCUBA diving, does not require any qualifications to go and try for obvious reasons- everyone already has all the equipment they need. There is no gatekeeper, no one telling you what is right and wrong, what is safe and unsafe. A SCUBA instructor will make sure you know how to rescue yourself when you are using scuba- what to do when your regulator falls out, if you run out of air, if you run out of air and your buddy isn't around.
Freediving has stringent safety measures that will cover any scenario, just like SCUBA diving, but these safety measures are only taught in a course.
Up until recently, Tasmania did not have regular freediving courses, and instructors had to be flown in from another state or students had to find their own teacher outside of Tasmania. This is a significant deterrent for people who are wanting to freedive and is unsafe.
There is a free online safety course for freedivers, presented by Ted Harty, a leading freediver instructor and competitor in the U.S.
It's not a good substitute for a freediving course, but it tells you exactly how to dive safely. We strongly recommend taking it!