Start of Season 7 (7.1 - 7.11)
Lessons about slaying, incorporating a little self-knowing dig.
DAWN: But he's new. He doesn't know his strength. He might not know all those fancy martial arts skills they…
End of Season 6 (6.12 - 6.22)
6.12 DoubleMeat Palace
Unusually, we start with some description of events we haven't seen - visiting the trio's den only to find they're gone.
BUFFY: Wow. They're all so identical.…
End of Season 3 (3.12-3.22)
Apparently Faith isn't interested in "proper training". Also, being older than Buffy, it's possible she would have known about the 18th birthday slayer test if she had been around.