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Don't be clever - Though you could cram a lot of logic into one line or use esoteric syntax, it only makes the code less readable and more likely to be buggy.
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Don't pre-optimize - Find out what actually needs to be optimized before using up your time doing it. Focus on getting the code working.
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Comment well, and comment often - Comments should help anyone with a basic knowledge of programming understand the why behind your code. The means that anyone in the future can work on it.
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Write code that does one thing well - When code is written in small modules, it is much simpler to test, write, and collaboratively work on.
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Keep it Simple Stupid - Don't complicate things needlessly. The simple solution is often the best.