All the basic text formatting tools are available in the toolbar when you edit pages. It looks like this:
The site supports bold, italic, and underlined texts. Of course you can combine all these.
Paragraphs are created from blank lines. If you want to force a newline without a paragraph, you can use two backslashes \\ followed by a whitespace (or the end of line).
You can use up to five different levels of headlines to structure your content. Use the 'H' button in the toolbar If you have more than three headlines, a table of contents is generated automatically.
Highlight the text and hit the 'Quote' button.
The result looks like this
You can add footnotes 1) with the 'Footnote' button - they appear at the base of the page.
Note: For the beta version, only authorised users can add images.
Use the 'Add media' button in the toolbar. This will allow you to choose a file from your own filing system, then upload it. After it's uploaded, click on it's name (or the image) in the list and it will be inserted into the page (here you can choose sizes, link options etc ).
Note that there's a limit on the size of files you can upload - if in doubt use a photo-editing app. to re-size your image to a reasonable size before uploading.
Please respect copyright restrictions of any images you upload.
You can rate the contents of a page using the yellow 'Star' button in the toolbar.
For special notes, disagreements and warnings etc. you can change the font color using the red 'A' button in the toolbar.
Like this or this or this
You can also use the HTML subscript and superscript tags.
This is a very basic overview of the available syntax - if you want to read the full syntax manual, go here