Joint related functions in GameMaker physics can be complex and confusing, so it's dangerous to go along. take this!
Use this interactive demo project to quickly observe and learn how all 9 types of joints works, whenever you needed.
The source project and a compiled windows excutable is included in this asset.
Joints are a deep level concept in box2d physics.
All the contents in this asset assumes that the user has the sufficient knowledge of box2d physics.