The unwritten rules
Doors typically open in the early afternoon and lights go out around ten; most albergues put you out by eight the next morning, because they have to clean before the next forty people arrive. Boots come off at the door. Plastic bags at 5am are the single most resented sound on the Camino — pack the night before if you plan an early start.
You need a credencial — the pilgrim passport — to be given a bed at all. Buy one at your starting point, at a cathedral, or from a confraternity at home. It is also what you fill with stamps, and what you hand in at the end for the Compostela.