What do states primarily use their reserved powers to regulate?

States primarily use their reserved powers to regulate a range of activities related to the health, safety, and welfare of their citizens. These areas can include education (establishing schools and setting curriculum standards), public safety (creating and enforcing criminal laws), health (regulating hospitals, health care, and public health initiatives), welfare (providing aid for needy individuals), transportation (building and maintaining roads and transportation systems), and local governance (empowering cities and towns with the authority to manage local affairs). The reserved powers are granted to the states by the Tenth Amendment to the U.S. Constitution, which says that any powers not specifically delegated to the federal government by the Constitution, nor prohibited to the States, are reserved for the States or the people