The US state of Georgia restricts access to birth certificates and they are behind a snail-mail pay wall. You can only legally request a birth certificate for yourself and certain close relatives. The only ancestors whose birth certificate you may legally obtain is your own parents.
Registration of birth certificates began in 1919. If they can’t find the certificate you requested, you still have to pay.
So, before I pay money, (at least $25 as of Jan 2018) fill out a lot of paperwork and wait for a while, exactly what genealogical information can I expect to find on a Georgia birth certificate?