WikiText can be typed by using the [[Editor toolbar]] or by typing by hand. While the first is convenient the later can be faster when you know the WikiText markup code.
With that definition in place, `<<youtube 1g66s7UbyuU>>` generates the URL https://www.youtube.com/watch?v=1g66s7UbyuU
! Advanced WikiText
Advanced WikiText features allow you to produce automated lists and interactive features like dropdown menus. In fact, the entire user interface of TiddlyWiki itself is written in WikiText, so any feature that you see in TiddlyWiki can be adapted for use in your own wikis.
Some of the advanced features require complex coding. TiddlyWiki includes several built-in macros that simplify common user interface tasks, like tabs, tables of content, and lists of tiddlers.
! Find out more
See [[WikiText]] for a detailed introduction to writing WikiText.