What are the limitations of free speech?

The general rule about individual rights and freedoms are, my rights stop when it infringes upon your rights. You have a right to free speech, but you cannot threaten someone. That is considered criminal. You cannot speak untruths as you could be sued for defamation of character, complete with possible damages. You cannot insight a riot or other violent, possibly injurous behavior. You are basically telling someone to hurt or injure someone else. That too is considered criminal behavior.

So, as long as you confine your right to free speech to comments or conversations, without threatening violence, insighting riots or lies, you should be fine.