Start by writing a page in a file and opening it with the browser. This can use script and even import libraries from a CDN. But as you write more, you will create modules that can be imported into your emerging application.
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digraph { rankdir=BT node [shape=box style=filled fillcolor=palegreen] Assets -> Modules [label=serve] Assets -> WebApp [label=fetch] Assets -> WebPage [label=fetch] CDN -> WebPage [label=script] Directory -> Server [label=localhost] File -> WebPage [label=open] File -> Wiki [label=upload] Modules -> WebApp [label=import] Server -> Assets [label=serve] Server -> Modules [label=serve] WebPage-> WebApp [label=becomes] Wiki -> Assets [label=hosts] }