Your AP may have two radio/antenna combinations, in 2.4G and 5G radio bands. You can advertise up to 8 SSIDs on each radio, but less than 5 is recommended.
The APs do not interfere with themselves, but use time division multiplexing
methods to share the bandwidth among the wireless clients using your SSIDs.
Investigate CWNA (Certified Wireless Network Administrator) training online for