The Celts were tribes of warriors with similar language, religion and culture; who gradually established themselves in the British Isles between 500 and 100 BC.
They brought there iron working, which helped develop local independence and trade.
We don’t know if they built hill forts or if they were made by the native Britons, they consisted of a small ditch and bank surrounding a hilltop.
They basic unit of their life was the clan; multiple clans joined together formed tribes with different customs and social structures.
They lived in huts made of timber and practiced agriculture, but their main activity was fighting in wars.
Women were almost equal to men; in fact they had property, they could marry whoever they wanted and even lead warriors.
They relied on the oral transmission of culture through bards and worshipped the natural elements.