The gods fall into two groups, the Aesir and the Vanir, said to have fought a war and settled it by exchanging hostages. Odin presides, associated with poetry, sovereignty, the dead and the pursuit of knowledge at any price, and he is not a safe figure to deal with. Thor defends gods and humans against the giants, and appears far more often in personal names and in amulets than Odin does, which suggests the literary record overstates Odin relative to ordinary devotion. Freyr and Freyja, of Vanir origin, govern fertility, prosperity and love. Tyr is connected with law and with the binding of the wolf Fenrir. Loki has no attested cult anywhere.
Practice centred on the blot, a sacrifice at which an animal was killed, cooked and eaten, its blood sprinkled on the participants and the precinct. The sumbl was a formal round of drinking in which toasts, boasts and oaths were made binding before witnesses. Rites took place in halls, at open-air enclosures and at natural sites; purpose-built cult buildings are attested archaeologically but were not the norm.
There was no single doctrine of the afterlife. Warriors chosen by Odin go to Valhalla, half of the slain go to Freyja, the drowned to Ran, most of the dead simply to Hel, and a strong separate tradition has the dead remaining in the burial mound near the family farm. Ragnarok, the destruction of gods and world followed by renewal, is described most fully in the poem Voluspa, which was written down after conversion and may carry Christian influence.
Underneath much of it lies a sense of fate as already laid down, which honour requires one to meet well rather than escape.