You cannot express or advocate viewpoints that "harass people (beyond a some limits), threaten them, defraud them, incite violence, distribute copyrighted information that isn't yours, interfere with others' activities (sing loudly in a movie theater), etc."

For example, someone could not express the viewpoint that 'thebigwinning sexually assaulted coworkers and stole money at their last job'. It would slander you (an exception to free speech that I omitted in the GP) and you would be entitled to damages.

Nor could someone express to an angry crowd the viewpoint that 'the bigwinning should be assaulted', nor could someone selling cryptocurrency express the viewpoint that 'cryptocurrency is a safe, stable investment for unsophisticated investors', etc.