In order to learn how to snowboard, you will first need the board itself, bindings and boots. If you decide to buy this equipment right away, you can read the article about choosing a snowboard.
If you are not ready to spend a lot of money right away, you can rent equipment. All that remains is to choose suitable clothes and take care of protection.
You can start learning how to snowboard without an instructor. There are many videos on the Internet, the authors of which show the basic elements, and mastering them is not so difficult.
For example, on the very first day, you will most likely be able to go down on the heel edge, and after a few training sessions you will be able to master the edge change. However, there is still a difference between self-study and working with an instructor.
A long time ago, there were no instructors, and people learned to ride on their own, including me. There was not even a ski resort in my city, only an ordinary hill. I was inspired by old snowboard videos: I watched riders riding and tried to imitate them.
Incorrect technique is formed if a person does everything intuitively, not knowing which direction to move in. And even so, he will still learn to ride and even enjoy it. But technical errors can hinder progress, and they look unaesthetic.