I took some time off working on Battle Buggy Glitch to create a quick ebook on how to make Games In GameMaker Studio. Here's a link to the itch.io page.
Basically it's course on making games in GameMaker Studio using GML (GameMaker Language). It's meant for those new to making games in GameMaker using GML and is a fun challenge for those who are completely new to game development as a whole.
I really looked back to the challenges I had faced not knowing exactly how to get started in game development with little (well almost no) experience in making games. I made this book for guys out there who were once in my shoes.
The 3 games I help you build are simple but get increasingly challenging. Here's a quick pic