What are some features to consider when choosing a short bike lock for securing your bicycle?

When choosing a short bike lock for securing your bicycle, consider features such as the material of the lock (preferably hardened steel), the type of locking mechanism (such as a secure cylinder lock), the thickness of the lock (thicker is generally more secure), and any additional security features like anti-drilling or anti-picking mechanisms. It's also important to consider the size and weight of the lock for convenience and portability.