Answer:
1. a note/interval/key that is equivalent to another note/interval/key but spelled differently.
2. G#
3. Ab
4. enharmonic equivalents
5. basically the notes stated in the picture, they're all repeated
6.c flat=b
b sharp=c
f flat=e
e sharp=f
i would consider myself pretty decent at music theory since ive been playing violin for a while. good luck whatever ur doing lol