Become familiar with a graphic design tool. For example, Adobe PhotoShop is a very popular image editing suite. A beginner using PhotoShope should learn how to use functions like the magic wand or lasso. Other options for graphic design programs include GIMP or PhotoScape.
Find an online resource or instruction book pertinent to your tool of choice. For example, there are dozens of guide books available for programs like Adobe Flash.
Practice completing tasks in the guides you find. For example, a universal graphic design tutorial involves creating a background for a computer desktop or website background. A person trying to complete this task should see if they can make an aesthetically pleasing and professional backdrop.
Apply learned skills to custom practical objectives. For example, a great project for beginning graphic designers is a website template.
Publish completed work and get feedback. For example, if you create a website banner, use it on a website and conduct a poll asking website visitors what they think of your work.