Hi, not discouraging others from contributing more on the subject, but fyi, you can get started here
Is there a relation between the actual Goths and the modern subculture? a quick summary by /u/scarleteagle
Goths and The Goths - featuring /u/bitparity; also has a links to a few more
How did the 'Gothic' go from referring to an ethnicity to a description of overtly nihilist teenagers? - featuring /u/x--BANKS--x
These posts have been archived, so if you have follow-up questions, ask them here & tag the relevant username