I'd love to tell you, but the number of times I may post per day on this site is rate-limited. ;)

One definition of free speech is the freedom of a people to speak their minds openly that power may be held to account. In that regard, it's an extremely useful tool for a free democracy to remain free; it minimizes the risk of the systems of power becoming unquestionable, which tends to create bad feedback loops that ultimately detach such power from its utility in serving the people.

Another definition is saying whatever one wants on any topic without consequences. This is not the same as the first, and has questionable utility in a free society.