BBCode is a set of tags based on the HTML langauge that allow you to add formatting to your posts like with standard HTML. However BBCodes will not break the layout of the pages you are viewing.
Forum and WIki Core BBCodes
[b] [i] [u] [bold] [italic] [underline] [url] [email] [img] [size] [vbsize] [highlight] [font] [left-align] [right-align] [center-align] [youtube] [color] Spoiler: Show [table]
Using BBCodes in the Wiki
[bold]Text to be emphasized[/bold] www.example.com firstname.lastname@example.org