There is no common set of laws within a dictatorship because the laws are always decided by the dictator himself. Most dictators enact laws that are meant to better the country, but the actual benefit of such laws is subjective.
A dictatorship is a form of government wherein a single person or group possess full and unrestricted power over the country's laws and resources, with no oversight by a constitution or the population. A dictator is able to enact any laws he wishes relating to funding, military actions or taxes. The dictator typically has a specific vision for the country, which is intertwined with his own personal goals and beliefs, and thus the laws tend to focus on achieving those goals and impressing his ideals upon the citizens of that country.
One well-known example of a dictatorship is Nazi Germany, in which Adolf Hitler was a single figurehead and ruling leader of the country. Compared to the United States, which has a system of checks and balances amongst three branches of government, Hitler had sole discretion as to what actions Germany took and what laws affected its citizens. For example, Hitler was the single person responsible for outlawing Judaism as a religion within Germany. He was also the only person capable of making the decision to declare war on neighboring countries.