Wéstyā
Or as I write it, Wéstya. Her name means "She of the Household" or "Burning one". Other names for her are Démspotnī, "Lady of the House", Hā́sānoyā (with a hard h like the ch in loch), "Goddess of the Hearth" and Tépṇtī, related to "Warming"
Wéstya is the goddess of the hearth. She also rules over fire, the home and food stores. As the patron of the home fire, she embodies the very basis of the house and family. She is the place of refuge to which we go to feel safe, rest and be with those we consider our kin.
Wéstya has domain over fire in its role as the warming center of the house and also as a source of cooked food. Fire relates to purity, so Wéstya is deeply associated with purity.
(She is not however the Proto Indo-European deity of fire itself, they are another déiwos we will see later on)
She also plays a key role in ritual and has connection with the concept of eternal fires (fires that were never extinguished). Veiling seems to be a way to honor her too.
Wéstya also rules over the Dṃyṓs, household spirits who protect each home and their member (akin to the roman Lares and similar household spirits)
Offerings
taken from here
Fire
butter or oil lamp
Clarified butter
red, yellow, and orange beads
Devotional acts
Lit up candles (stay safe)
Tidy up your room or your home
Cook for your family/kin
Take care of relationships with your family
Organize your shelves and fridge
Veil
Honor your house and how it shelters you
Get something new and needed for your home (maybe a new rug, cleaning implement or table you have been needing for ages)
Associations
Colours red, yellow and orange
Fire
Cooking
Food storing
Rowan
the feast of Imbolc
February
Descendants in later pantheons
Hestia (Greek)
Despoina (Greek)
Vesta (Roman)
Tabiti (Scythian)
Brigit (Celtic), according to this