What are your legal rights if you have been given a 30 day termination notice?

It depends on whether you have a contract that the employer is breaching by firing you, or whether the employer is firing you for an illegal reason (provided that you can prove this). Otherwise, in Georgia, the rule is that you are employed at will, and the employer doesn't need to give you any advanced warning or any reason for its decisions affecting you so long as its actual reason is not an illegal one. (race, religion etc.)