Wikitext is extremely powerful, but can take some time to fully internalize. When clicking the buttons on the editor toolbar isn't enough to remind you what syntax to use, you can review this concise, example-heavy appendix for details on the most common wikitext markup.

This reference is not exhaustive. In particular, widgets are not included, as that would make it unreasonably long. You can quickly find details on all the widgets by searching in the TiddlyWiki documentation.