I have many fav eps on buffy but im just going to name my all time fav ones. Also check out the ep guide.
starting with:
Ted: This was from season 2 i thought it was really good and weird, this ep was when Buffy the show was at her prime and every ep was good.
Surprise: anther good ep. I like it because Dru was in it. it was a awsome ep.
Becoming part 2: Just a really sad but good ep.
The prom: anther sad ep
Hush; the first ep with Willow and Tara action.
New moon rising: Willow picks Tara.
I like all of season 5 cause thats when I started watching Buffy. I thought almost every ep in season 5 was good. ( I got caught onBuffy by watching FX)
All the way: I loved Dawn in this ep.
Tabula Rasa: This was a funny ep but Tara left Willow which was sad.
Wrecked: Wllow having hard times
Seeing Red: I really really like this one.
Villians: Willow turns evil
Two to go and grave: I loved Willow evil but she was freaking me out also.