There are six different types of Tithi in Hindu astrology. Jaya Tithi is one among them. Tritiya, Ashtami are Trayodasi tithis. They are considered generally bad tithis.
The tithis are avoided in some regions as they are considered inauspicious.
Jaya Tithi is chosen for propitiating various forms of Mother Goddess.
Food donation and helping people during the period will help in redemption.