Gamemaker 2.3 Beta is out! Changes include structs, methods and sequences! If you want to read more about these changes, you can check the official blog posts!
https://www.yoyogames.com/blog/549/gamemaker-studio-2-3-new-gml-…

Yoyo games just released an article about buffers and how to use them in a checkpoint system. It is worth checking it out:
https://www.yoyogames.com/blog/564/coffee-break-tutorials-checkp…