The first amendment to the Constitution of the United States:
Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the Government for a redress of grievances.
I think it’s worth reading the actual text from time to time. It’s short, simple, and easy to understand.
But I think there is some often ignored nuance to the way it is written — the Constitution doesn’t give you rights, it protects your rights. These are rights that you already have and the Constitution prevents the government from infringing upon them.