What is GHS Format?

When setting up GHS labels and/or pictograms it is sometimes hard to know what should go where. Is there a set format in place for this type of thing, or is it just whatever seems right at the time? For example, in the GHS diamond with pictograms, what should you do if you have multiple different types of hazards (even sometimes in the same category)? What goes at the top, the left, the right, and the bottom?

Trying to implement GHS and want to make sure it is done properly the first time, so people don’t get into bad habits!