Horizontal ruler:\\
{{{----}}}
gives you:
----


Paragraphs are delimitted by a blank line.
{{{This is Paragraph 1

This is Paragraph 2
}}}
gives you:

This is Paragraph 1

This is Paragraph 2

----

Forced Line Break: 
{{{This is first line,\\this is second line!}}}

gives you:

This is first line,\\this is second line!

----

Hyperlinks
{{{[~Main] , [http://www.mssl.ucl.ac.uk], [~GeneralEditSkills#~]}}}
gives you:

[~Main] , [http://www.mssl.ucl.ac.uk], [~GeneralEditSkills#~]

----
Text with a hyperlink
{{{[MSSL Homepage|http://www.mssl.ucl.ac.uk]}}}
gives you:

[MSSL Homepage|http://www.mssl.ucl.ac.uk]