!!!Unnumbered Lists
Whitespace before asterisk not allowed.
{{{
* unnumbered list
}}}

!!!Numbered Lists
Whitespace before asterisk not allowed.
{{{
# number list
}}}

!! Bold

{{{
**bold**
}}}

!! Italics

{{{
//italics//
}}}

!! Headings
{{{
= Level 1 (Largest)
== Level 2
=== Level 3
}}}

!! Internal and External Links

{{{
[[link]]
[[MyBigPage|go to my page]]
[[www|desc]]
}}}

!! Paragraphs
(blank line makes paragraph)

!! Linebreaks
(consensus: treat line breaks as line breaks)
(best practice: line continuations made with backslash at end of line)

!! Nowiki and preformatted in-line or block
No wiki markup is interpreted between these characters. (ignore spaces below)
{{{
{ { { pre } } }
}}}

!! Placeholder / Native Markup Block
When there is something advanced like tables, a placeholder will show up, so users will not be confused seeing more than one syntax. (optional for wiki developers)
{{{
<<x>>
}}}

!! Inclusion

Technically "transclusion", but sounds weird for end users. 

{{{
{{ include this! }}
{{ include this! | unspecified stuff }}
[[some link|{{Image:Stuff.jpg}}]]
}}}

!! Horizontal Line
{{{
----
}}}