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Once a project exists, most of your time is spent in the develop-and-iterate loop.
1

Start dev mode

nf dev serves the game and watches your files, so changes are picked up as you work. Keep it running in a dedicated terminal.
2

Point at a different config or directory

Working in a monorepo or with multiple configs? Every command accepts -d and -c:
Need runtime values like a server address or ports? Put them in a .env file - see Environment variables.