GAME MAKER TUTORIALS
Here are a series of tutorials to help you undestand some of the aspects of Game Maker a little bit better.
Particle System Tutorial
A step by step tutorial to learn the Particle system in Version 5 of Game Maker. There's no real need to recreate this for newer versions. Once you understand this, you'll understand the changes in version 6 and up of Game Maker.
GML for Drag and Drop Icons Ver 6
This PDF file shows all the equivalent GML coding for the Drag and Drop Icons found in the object properties window of the Game Maker program. For those wishing to to go from Drag and Drop to code.
GML for Drag and Drop Icons Ver 7
This is the updated document for Version 7 of Game Maker for the above. Not only has all the coding been updated, but a new section listing all Action Functions are included.