If you are working in a group, make sure you are running on the same version of GMS and only update when given a fair warning. They also have comprehensive 3D and shader introduction videos. Highly recommended to check out the full playlist if you're a complete beginner.
A comprehensive introduction to basic features of the IDE. GameMaker is a user-friendly, cross-platform game engine by YoYo Games that allows both beginner and advanced game developers to create 2D and 3D games for desktop, HTML5, and console platforms.
A curated list of awesome libraries, snippets, guides, and projects for GameMaker.