@Hyolobrika Overly hasty clicking of the "post" button.
So, saying something that isn't true, even something that you believe to be false (a lie), that's a matter of free speech. Doing it to defraud someone, or to cause a problem (as in the case of slander/libel), that's an "illocutionary act", not related to freedom of speech. The distinguishing factor is what you intend. That's tricky to prove: you can't actually know what's in someone's head. So fortunately, the way it plays out in court is that you have to show damages, show intent to cause them, and show that what was said was false. I think this aligns, more or less, with an intuitive understanding of what a society should tolerate.