Legacy of Yu

No — the rulebook explicitly warns not to open or shuffle the Story Book/Deck; follow the Story Book/Deck instructions as written and reveal pages/cards only when the game tells you to (pp. 2–3).

You have four legal uses for a Townsfolk card: play it, discard it, tuck it, or spend it as food; use whichever option suits your action choices on that turn (p. 8).

Yes — Hut workers are returned during the Harvest step when you resolve returns and draw Townsfolk, as explained in the Harvest rules and the section on placing workers on Huts (pp. 7, 13).

Building a Canal includes a step to move the barge and then resolve the canal’s card effects; flood advancement and the round timing for it are handled in the round phase rules, so follow the canal construction steps together with the round/flood rules (pp. 9, 6).

Resolve Barbarian attacks by following the step‑by‑step procedure in the Barbarian section (assign defenders, resolve outcomes, apply rewards), then carry out the final attack resolution as described in the resolution rules (pp. 10, 13).

The rulebook lists the campaign loss condition(s) and how to store progress between games; if you meet the defeat condition you follow the defeat instructions and use the victory/defeat card and storage rules to record outcomes for the campaign (pp. 15).