Try Netflix for free for 30 days?

I want to make an account and try for free for 30 days. My question is. Before the 30 days end, I have to do something there to cancel it or it is automatically renewed or how is that. I only want the 30 days so I already know that I will not buy a subscription. But I have to stop dan before it ends or how is that

Yes you have to cancel it. The hope that you forget it, you must also specify a payment method for the free subscription.