Getting started
On a Wiki with Scribunto enabled, create a page with a title starting with Module:, for example "Module:Example". Into this new page, copy the following texts:
local p = {} -- p stands as the package name
function p.hello( frame )
return "Hello, world!"
end
return p
Save that, then on another non-module page, as on a sandbox page, write:
{{#invoke:Example|hello}}
which will return the text: Hello, world!.