Animated sprites can be made by importing frames from a sprite sheet or by creating individual images in a 3rd party program. What happens, though, if you don't have access to these methods? GameMaker includes its own image editor that, while not as versatile as programs like Photoshop, has received some recent upgrades that can help you create some decent animations.
Let's make a player character sprite with a simple walk cycle. If you haven't already, now would be a good time to open GameMaker, start a new project, and create a sprite. Name the sprite
Using descriptive names like this allows you to categorize your assets, which makes finding the right asset much easier.
As mentioned ...