# Line breaks
**A single press of Enter will not start a new line.** 
Add two spaces at the end of a line, then press Enter.   
Put a backslash () `\` at the end of a line, then press Enter.\
Use the HTML tag `<br>`.<br>
# Font & Text Emphasis.  
Text emphasis is an important writing skill. Markdown provides simple ways to apply bold and italic styles.  
Markdown supports two common text styles: bold and italic.  
Bold syntax: Wrap text with two asterisks ** or two underscores __.  
Italic syntax: Wrap text with one asterisk * or one underscore _.  
Bold and italic syntax: Wrap text wiht three * or _.  
For example: *Italic*,**Bold**,***Bold and italic***.  
# Horizontal Rule (HR)  
In Markdown, the Horizontal Rule is used to add a dividing line, and its usage is very simple.  
Simply enter three or more identical symbols (*,-,_) on a single line. Spaces between symbols are allowed and will not affect the display.  
- - -
___
* * * 
# Strikethrough  
Strikethrough syntax: Wrap text with two tilde marks ~~  
~~For example~~  
# Underline 
Markdown has no native syntax for underlines. You need to use HTML tags instead `<u>`.  
Syntax: Use the tag `<u>` to wrap the content.  
<u>Underline text</u>    
# Footnote
Footnotes are used to add supplementary notes, explanations or citations to text.  
[^Footnote]: not only