Title your Cards in such a way that will make them easy to read and easy to search for. Here are some guidelines you might use:
Keep it short - No more than 10 words total, and short enough to keep the Card's URL as concise as possible.
Keep it searchable - Include keywords your teammates will search for, and make sure the title works effectively with your established tag structure.
Keep it unique - Make sure your Card's title distinguishes it from other Cards on a similar subject.
Your Card might error during saving if the Card title contains HTML, such as words directly between angled brackets (for example, "<Title>"). Guru has a fairly broad approach to security in order to avoid the possibility of someone creating a Card with malicious intent.
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