Shehechiyanu

The blessing of Shehechiyanu ("... who has kept us alive, sustained us and enabled us to reach this occasion") is recited during Kiddush (literally, "sanctification" - is a blessing recited over wine or grape juice to sanctify the Sabbath) on all nights of Yom Tov (Festivals), except on the last days of Pessach (Passover).

There are two Minhagim (customs) regarding Shehechiyanu at candle-lighting on Yom-Tov candles. Some women have the Minhag of saying Shehechiyanu when lighting Yom-Tov candles (except on the last days of Pessach). Others never say Shehechiyanu at candle-lighting but rather listen or say it with Kiddush. If a woman makes her own Kiddush she must be careful to only say Shehechiyanu once, either at candle-lighting or during Kiddush.

On the second night of Rosh Hashanah (New year) there's a Halachic debate if Shehechiyanu is required. To be on the safe side, one should wear a new item of clothing, or see a new fruit (that one hasn't tasted yet this season) while saying Shehechiyanu on the second night of Rosh Hashanah; both during Kiddush and during candle lighting (if applicable). If one does not have a new item of clothing, nor a new fruit, on the second night of Rosh Hashanah, one still says Shehechiyanu.

Source: Kitzur Shulchan Aruch 103:4, 129:23 See Halocho #109