A more thorough explanation:

The First Amendment is a part of the United States Constitution that protects the rights of individuals to freely express themselves and practice their religion without interference from the government. It was added to the Bill of Rights in 1791 and has been interpreted by the Supreme Court to apply to the entire federal government and state governments.

The First Amendment guarantees two clauses that protect freedom of religion. The Establishment Clause prohibits the government from establishing an official religion or favoring one religion over another. The Free Exercise Clause prohibits the government from interfering with a person's practice of their religion. For example, the government cannot force someone to follow a certain religion or prevent them from practicing their own religion.

The First Amendment also protects freedom of speech and press. This means that individuals have the right to express themselves without government interference or regulation. The government must have a substantial reason for interfering with free speech, and even then, it must be content-neutral. For example, a person cannot be held liable for speaking the truth or expressing an honest opinion. The right to freedom of the press allows individuals to publish and disseminate their ideas without government interference.

The First Amendment also guarantees the right to assemble and petition the government. This means that individuals have the right to gather for peaceful and lawful purposes and to ask the government for relief for a wrong through litigation or other governmental action. For example, people can gather to protest a government policy or ask for a change in the law.

Overall, the First Amendment protects the fundamental rights of individuals to express themselves and practice their religion without interference from the government. It is a cornerstone of American democracy and has been interpreted by the Supreme Court to apply to all levels of government.