ASERES YEMEI TESHUVAH
Throughout the Aseres Yemei Teshuvah, add Shir hamaalos mimaamakim after Yishtabach.
Remember to add/replace the additions for Aseres Yemei Teshuvah in Shemoneh Esrei.
Additionally, say the long Avinu Malkeinu during Tachanun at Shacharis and Minchah (instead of the short paragraph beginning with these words that is usually said). Say the words that apply to the Aseres Yemei Teshuvah (i.e., chadesh instead of barech, and kasveinu besefer instead of zachreinu).
If you were unable to say tashlich on Rosh Hashanah, do so during the Aseres Yemei Teshuvah.45
Similarly, if you will be unable to do kaparos on Erev Yom Kippur, do it earlier, during one of the Aseres Yemei Teshuvah.46
For more fast-related laws, see below, "Hosafos."
It is customary to increase in giving tzedakah on a fast day, in quantity as well as in quality (by giving it in a cheerful and pleasant manner).48
Shacharis and Selichos
The congregation does not recite Aneinu by Shacharis. The chazzan, however, recites Aneinu during chazaras hashatz (as a separate berachah between Goel Yisroel and Refaeinu).
Selichos for Tzom Gedalya are recited before the paragraph "Shomer Yisroel...” in the Selichos for Monday after Tachanun. Begin with the paragraph Dirshu Hashem behimatz'o, and skip from Elokeinu veilokei avoseinu until vaʼanachnu hirshanu, as well as from Vayomer David until yeivoshu raga. Conclude with the words ki ein ozer (in the paragraph Misratzeh berachamim).49
Selichos are followed by the long Avinu Malkeinu. Say the words that apply to the Aseres Yemei Teshuvah, and not those that apply to a taanis tzibur (see above).
Avinu Malkeinu is followed by Vaʼanachnu lo neda, Chatzi Kaddish, and krias hatorah.
For more on Shacharis and Selichos, see below, "Hosafos."
Krias Hatorah
Vayechal is read during both Shacharis and Minchah.
The congregation recites aloud the pesukim of Shuv meicharon apecha, Hashem Hashem Keil rachum vechanun (until venakei), and vesalachta, followed by the baal korei.50
For more on krias hatorah, see below, "Hosafos."