What people get wrong
Myths, and what the sources actually say
They all wore horned helmets
Many people think Vikings wore horned helmets, but this is not true. Manx Nat. Heritage The stereotype of Viking helmets having horns goes back to costuming in 19th-century opera. Britannica Horned helmets would have been impractical during combat. Britannica They may have been worn only for ceremonial purposes in pre-Viking times. Britannica
Sources differ — a little — on horns
Manx National Heritage is blunt: many people think Vikings wore horned helmets, but this is not true. Britannica traces the popular image to 19th-century opera costume, and notes that horns would have been impractical in combat. It also allows that horned helmets may have been worn for ceremonial purposes in pre-Viking times. That is a different period, and it is not evidence for Viking Age battle gear.
They were only raiders
Most Vikings were actually ordinary farmers, not full-time raiders. Nat. Mus. Denmark The Vikings were mainly farmers, fishers, hunters and skilled craft workers. British Museum Many Vikings traded with Europe, Russia and Asia, exchanging furs, walrus ivory, amber and slaves for silver, gold and luxury goods. British Museum These newcomers made a living as farmers, craftsmen and traders. Nat. Mus. Denmark
They left no writing
The Vikings themselves wrote short messages in runes on wood and stone. Nat. Mus. Denmark The Vikings did not write books themselves. Nat. Mus. Denmark
They did not write the books we now lean on. Other people did, which is why those books need caution. Short messages in runes are a different kind of record, carved on wood and stone.
The age has one official start and finish
It does not. Denmark’s 800–1050, the English 793–1066 story, and “by 1050 it was over” in Scandinavia are all in circulation in serious sources.