Every citizen ought to know the Law of the Land. There is no excuse for not knowing the law. Moreover, there are different types of law. Ignorance will not help a person defend him or herself in a legal crisis. It can never be explained away.

Even when you have not acted against the law, you might need to know the law in order to protect yourself from people who might violate the law. To know ones rights and privileges is not only beneficial, it is absolutely essential. You will never know when the information you have at your disposal might come in handy. Having it ready before any crisis strikes will help you take immensely wiser and more informed decisions which you will not regret later. Just as there are varied disciplines in the field of medicine, there is a wide range of divisions when it comes to law. For instance, everyone knows that you don't visit a general physician for a severe heart ailment. You want to consult a heart specialist in this case. Likewise, for every particular type of law, there are specific attorneys who specialize in that particular field. It really helps to search and identify the suitable attorney for your particular case, instead of heading to the nearest or most familiar attorney for every case. 

This website lists the various types of law, giving a brief definition for each and points you to resources that might help you in choosing the right solution for your particular need. 

Spend some time learning the various types of law and the specific attorneys handling each type. The information that you possess will someday help you or enable you to help someone else in need.