Nothing is quite so hard on the eyes as long posts that are essentially one huge paragraph. Break those paragraphs up! Use the paragraph tag <p> to create new paragraphs (this will automatically add a blank line above it, which helps to create the separate paragraph).
Another HTML tag used in formatting posts is the <br> tag. This is equivalent to hitting the return key, in that it starts a new line of text. Two of them together equal one paragraph tag.
These symbols are created by typing in special HTML codes. For instance, typing in ® will create the ® symbol.
Some others include: ¼, ¶, ¥, £, «, etc...
For a complete list, visit this site^