Plot (T key): 16 × 16 tiles at level 1, its area grows with your level. You can only build, sow and raise animals on your own land. To abandon it: last slot of the building bar (with confirmation).
Building (B key): floors (also under an object), walls, doors (which only open for whoever built them), torches, fires, workbenches and stations, bed, chests, fences and gates, feeders.
Works (G key, shovel in hand): dig (you get earth), fill in (2 earth), sow wheat or corn.
Chests: wooden (18 slots), iron-bound (36 slots) or royal (72 slots, ingot shop), 64 identical items per slot, private contents. Drag and drop to tidy up, Sort button.
Salvage bench: to take apart items you no longer need (see
wear).
More room: when the mainland fills up, the portal east of the village leads to the New Lands, a large peaceful region where you claim your plot the same way.
Absences: a plot left unvisited for 30 days is freed for newcomers (an email warns you a week before). Nothing is lost: buildings, as materials, and chest contents wait in storage with Aubin.
Terrain matters: you can only climb one level at a time, you can jump down but you get hurt beyond 2 levels.