Chapter 3 discusses this in detail. Here's a very informal version:
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Unicode characters don't fit in 8 bits; deal with it.
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2 Byte order is only an issue in I/O.
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If you don't know, assume big-endian.
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Loose surrogates have no meaning.
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Neither do U+FFFE and U+FFFF.
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Leave the unassigned codepoints alone.
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It's OK to be ignorant about a character, but not plain wrong.
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Subsets are strictly up to you.
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Canonical equivalence matters.
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Don't garble what you don't understand.
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Process UTF-* by the book.
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Ignore illegal encodings.
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Right-to-left scripts have to go by bidi rules
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