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.
Everything has a meaning and so does the color, so pick it wisely.