While these infographics won't teach you everything you need to know about design, they'll definitely provide you with a high level overview. In them, you'll find everything from principals of design (C.R.A.P), to elements of design, to color theory. Enjoy!
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Principals of Design
Ah, the big four: Contrast, Repetition, Alignment, and Proximity. You know it's C.R.A.P :)
Elements of Design
Always try to have a strategic rationale for using design elements. If your only explanation for using any of these elements is simply "I like it", remove it. You don't need it.
Color Theory
Everything has a meaning and so does the color, so pick it wisely.
(source: paper-leaf.com)