A roper makes rope from a variety of materials such as hemp, straw and hair, while they sell ropes in the marketplace, they predominantly supply other trades, most notable the maritime industry.
Ropers will have a stall, cart to store to sell their wares from and a workshop in which to produce the items. Some industries, like boatmaking, have on site rope makers solely dedicated to producing rope for them.
While players are generally free to select a citizen role as a background, they should check with the Dungeon Master to make sure it fits within the local area, other party members and does not conflict with the intended adventure.
Citizens have proficiencies in weapons and armour relative to their type and region, so it is not included in the above information, and players do not gain any proficiencies from choosing a citizen background.