I'm not endorsing the image used here, because it doesn't make any sense at all. Am I going by color or thickness? What's the message here? There are better ways out there, like just knowing cooking times, but the short story is that you should figure it out. Like most things, you have to learn by doing. Just go buy a couple of cheap steaks and cook them until you figure it out. Or better yet, read instructions and actually apply them.
When people tell me they don't know how to do certain things, like cook a steak, I get infuriated. We live in a time where you can make a call and find out what molecular physics is all on the same device at the same time. You can figure out how to cook a steak. Google it.