How to get latest iOS updates and features before others

Apple every year releases a new iOS update with new features and enhancements in almost every section for millions of iPhone and iPad users. Last year it released iOS 11 and this year it is widely expected to bring iOS 12. While the iOS version is introduced at WWDC 2018 in June, Apple starts rolling it out in September or October to end users. However, there is a way using which anybody can get access to upcoming iOS versions before they actually hit iPhones and iPads at the end of each year. I