Social Structure
Every world ranks its people somehow. Yours must say how — without collapsing everything into one ladder.
Keep the pieces apart
Rank, wealth, authority, prestige, legal status, occupation, skill, and office are different facts that merely influence each other. A wealthy commoner is not noble. A poor noble is still noble. A skilled craftsperson is not automatically respected. A respected elder may hold no office. A titled courtier may command nothing.
Define, for your world: what nobility means and who holds it; what titles exist and what they actually carry; how offices are granted; what legal distinctions divide people; how wealth, occupation, and reputation move someone up — or down.
Grounded, not generic
Use the reference library for what hierarchies can look like. Then decide your own: is rank inherited, granted, bought, earned? Can commoners rise? Can nobles fall? What do peasants owe, and to whom, and what do they receive in return? No two projects need answer alike.
Good builder question
What can a farmer's clever child realistically become here — and what stands in the way? Your answer maps the whole structure.
You usually do not need...
...a complete table of ranks or a universal feudal pyramid. Establish who matters near play, how they got there, and what it costs to join or leave them.