Move with A / D or ← →. Jump with W / SPACE / ↑.
Tap / click a nearby block to mine it. Pick a block in the hotbar (keys 1-7) and tap empty space to place it.
Dig down to find ORE, chop TREES for wood, and build whatever you like under the rolling sky.
On mobile: on-screen arrows + jump, tap the world to mine/place, tap the hotbar to pick a block.