How to Play King Legacy
Take every quest on the starter islands, buy a cheap fruit or stick to melee, and put early points into Defense so you stop dying to NPCs. Use the compass / map to the next island when local quests are grey. Codes are Menu → Shop → Enter Code at the bottom.
First islands
Talk to every quest NPC. Kill the named enemies they point at. Do not sail to Second Sea content because a YouTube thumbnail said so.
Boat
A cheap boat plus the compass beats swimming. Dock, quest, leave. Pirates on the open water are optional fights you will lose at level 10.