Primary sources are sources of legally binding authority. It is, in other words, the law. The two most common sources are cases and statutes. Cases reflect how the judiciary has interpreted certain aspects of the law; statutes reflect laws passed by the legislature. If you believe you have a legal claim or right, showing the proper case law and/or statute to a court or other authority is how you prove it.
The law regarding Wills and Trusts in Florida is largely a statutory creature controlled by the Uniform Probate Code (UPC) and the Uniform Trust Code (UTC). Cases thus deal primarily with how Florida courts have interpreted the UPC and UTC.
This guide focuses on Florida law, so the sources cited will not necessarily be legally binding precedent in your jurisdiction. Additionally, as the law frequently changes, the information here could be outdated. As always, consult a licensed attorney before making any legal decisions.