Most homebrew settings live across six documents, a notebook and a group chat, which is why the answer to a player's question is so often improvised and then forgotten. Kalan Vidhi keeps a setting searchable, consistent and yours.
One keystroke searches every faction, region, NPC, deity and item at once. When a player asks who runs the port city, the answer is one search away — and it is the same answer you gave three sessions ago, because it is written down rather than remembered.
Define what magic can and cannot do, what it costs, and what happens when someone pushes it — as a rank ladder with limits rather than a paragraph of vibes. Players respect a system whose edges are consistent, and a stated rule is one you cannot accidentally contradict.
Events with causes and consequences give a setting the thing homebrew usually lacks: reasons. A war three centuries ago that still shapes who trades with whom is worth more at the table than a map with nice fonts.
Chapters work equally well as session prep, an adventure module, or the in-world fiction you hand players between sessions. Export the whole setting as a world bible when you want something to share or print.