A contract is an agreement entered into by two parties or more with the intention of creating a legal obligation, which may have elements in writing. wikipedia.org

In common law legal systems, a contract is an agreement having a lawful object entered into voluntarily by two or more parties, each of whom intends to create one or more legal obligations between them. wikipedia.org

Legal aid is the provision of assistance to people otherwise unable to afford legal representation and access to the court system. wikipedia.org

Legal research is "the process of identifying and retrieving information necessary to support legal decision-making. In its broadest sense, legal research includes each step of a course of action that begins with an analysis of the facts of a problem and concludes with the application and wikipedia.org

Criminal law is the body of law that relates to crime. It regulates social conduct and proscribes threatening, harming, or otherwise endangering the health, safety, and moral welfare of people. It includes the punishment of people who violate these laws. wikipedia.org

Civil law is the branch of law dealing with disputes between individuals or organizations, in which compensation may be awarded to the victim. wikipedia.org