Designs are not for just putting images or text on a page, it has to tell something to the people who are going to see your work.
Use two typefaces maximum
A change in typeface signifies change in meaning, and if you are trying to send a message having multiple typefaces can divert from the meaning you intend to get across.
Show one thing first
If you show your viewer multiple things at once, they could easily become distracted, so space your design out.
Pick colors on purpose
Color has its own emotions to them so pick colors to give your audience the emotion you want them to feel.
Negative space is magical
Negative space is used to direct your viewer’s eyes to what you deme important to the design, negative space is a handful tool to make your audience pay attention.
Treat type as an image
Type is just as important as the images of a design, type can also be used to create images to immerse your viewer into your design.
Be universal; it’s not about you
You want to make your design something that many people worldwide would enjoy, not what you alone would enjoy, because then you are just going to get a few people who like your design instead of many.
Measure with your eyes
Sometimes going by the rulers won’t make the image symmetrical and you will have to use your eye to be able to determine the proper placement.
Look to history but don’t repeat it
You can look to a design in the past to help give you good ideas to design a certain way, but don’t make it exact, because that design has been done before and people wouldn’t take an interest.
Symmetry is the ultimate evil
Symmetry offers little movement for your design and it limits you to what you can do.