I recently read this article on the changes from IBC 2018 to IBC 2021. It's the first part of a series from the magazine STRUCTURE. Highly recommend to read it for yourself since I don't fully grasp the extents of these changes but I am interested, which I guess is the first step into learning something new. I hope this prompts you to look into the new changes yourself and I look forward to the next few articles covering this topic in greater detail.