How does the First Amendment protect and limit the freedom of expression?

"The First Amendment guarantees freedoms concerning religion, expression, assembly, and the right to petition. It forbids Congress from both promoting one religion over others and also restricting an individual's religious practices."

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The First Amendment guarantees freedoms concerning religion, expression, assembly, and the right to petition ... It guarantees freedom of expression by prohibiting Congress from restricting the press or the rights of individuals to speak freely.