Solid double yellow in the center of a two lane road means a no passing zone both ways. If the line on your side is dashed, you may pass (overtake) (carefully). Both sides dashed means both sides may pass.
On 4 lane (or more) roads, the yellow lines may indicate a left turn lane (for either entering or leaving the highway).
Ask at any office of the motor vehicle bureau (or department of motor vehicles, whatever they call it in GA). They should have a free booklet with all those rules, specific to your state. There are standardized federal rules, but the various states don't always follow them. Or here is a web site that purports to have them
https://www.eregulations.com/georgia/driver/signs-signals-markings/
Still a good idea to get a driver's manual, though, as it has other information that you are legally required to know before operating a motor vehicle on a public roadway. For example, if the speed limit is not marked, there are specific rules as to the actual speed limit (and they are sometimes a lot lower than one would think).