D9 is normal thc. Thc-a is normal thc just nor decarbed yet. D8,10,etc are sketchy derivatives that are simmilar but synthetic or semi synthetic. Type 1 is primarily thc, type 2 is roughly half cbd half thc, type 3 is mostly or all cbd. But yeah delta 9 is normal thc, generally full spectrum (contains cbd, thc, minor cammabanoids, terpenes etc) is proffered because it’s more balanced than only thc extracts.