Many People dont know how to write a .md file so I fork the cheatsheet from somewhere else and put it here.
P.S. Github readme.md doesnt support html tags.

BETTER ONE

Headings

Markup :  # Heading 1 #

-OR-

Markup :  ============= (below H1 text)

Markup :  ## Heading 2 ##

-OR-

Markup: --------------- (below H2 text)

Markup :  ### Heading 3 ###

Markup :  #### Heading 4 ####

Markup :  ##### Heading 5 #####

Markup :  ###### Heading 6 ######

Text

Common text

Markup :  Common text

Emphasized text

Markup :  _Emphasized text_ or *Emphasized text*

Strikethrough text

Markup :  ~~Strikethrough text~~

Strong text

Markup :  __Strong text__ or **Strong text**

Strong emphasized text

Markup :  ___Strong emphasized text___ or ***Strong emphasized text***

Named Link and http://www.google.fr/ or http://example.com/

Markup :  [Named Link](http://www.google.fr/ "Named link title") and http://www.google.fr/ or <http://example.com/>

heading-1

Markup: [heading-1](#heading-1 "Goto heading-1")

Table

Table, like this one :

First Header Second Header
Content Cell Content Cell
Content Cell Content Cell 
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2
3
4
First Header  | Second Header
------------- | -------------
Content Cell  | Content Cell
Content Cell  | Content Cell

Colons can be used to align columns.

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| Tables        | Are           | Cool  |
| ------------- |:-------------:| -----:|
| col 3 is      | right-aligned | $1600 |
| col 2 is      | centered      |   $12 |
| zebra stripes | are neat      |    $1 |
Tables Are Cool
col 3 is right-aligned $1600
col 2 is centered $12
zebra stripes are neat $1

There must be at least 3 dashes separating each header cell.
The outer pipes (|) are optional, and you don’t need to make the
raw Markdown line up prettily. You can also use inline Markdown.

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Markdown | Less | Pretty
--- | --- | ---
*Still* | `renders` | **nicely**
1 | 2 | 3
Markdown Less Pretty
Still renders nicely
1 2 3

List

  • Bullet list
    • Nested bullet
      • Sub-nested bullet etc
  • Bullet list item 2
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Markup : * Bullet list
             * Nested bullet
                 * Sub-nested bullet etc
         * Bullet list item 2
  1. A numbered list
    1. A nested numbered list
    2. Which is numbered
  2. Which is numbered
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Markup : 1. A numbered list
             1. A nested numbered list
             2. Which is numbered
         2. Which is numbered
  • [ ] An uncompleted task
  • [x] A completed task
1
2
Markup : - [ ] An uncompleted task
         - [x] A completed task

Blockquote

Blockquote

Nested blockquote

Markup :  > Blockquote
          >> Nested Blockquote

Horizonal Line

Horizontal line :

Markup :  - - - -

Horizontal Rule

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2
3
4
5
6
7
8
9
10
11
12
13
Three or more...

---

Hyphens

***

Asterisks

___

Underscores

Three or more…

Hyphens

Asterisks

Underscores

##Line Breaks##
My basic recommendation for learning how line breaks work is to experiment and discover – hit once (i.e., insert one newline), then hit it twice (i.e., insert two newlines), see what happens. You’ll soon learn to get what you want. “Markdown Toggle” is your friend.

Here are some things to try out:

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Here's a line for us to start with.

This line is separated from the one above by two newlines, so it will be a *separate paragraph*.

This line is also a separate paragraph, but...
This line is only separated by a single newline, so it's a separate line in the *same paragraph*.

Here’s a line for us to start with.

This line is separated from the one above by two newlines, so it will be a separate paragraph.

This line is also begins a separate paragraph, but…
This line is only separated by a single newline, so it’s a separate line in the same paragraph.

(Technical note: Markdown Here uses GFM line breaks, so there’s no need to use MD’s two-space line breaks.)

Image

Image with alt :

picture alt

Markup : ![picture alt](http://www.brightlightpictures.com/assets/images/portfolio/thethaw_header.jpg "Title is optional")

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Inline-style: 
![alt text](https://github.com/adam-p/markdown-here/raw/master/src/common/images/icon48.png "Logo Title Text 1")

Reference-style: 
![alt text][logo]

[logo]: https://github.com/adam-p/markdown-here/raw/master/src/common/images/icon48.png "Logo Title Text 2"

Here’s our logo (hover to see the title text):

Inline-style: alt text

Reference-style:
alt text

Foldable Text

Foldable text:

Title 1

Content 1 Content 1 Content 1 Content 1 Content 1

Title 2

Content 2 Content 2 Content 2 Content 2 Content 2

Markup : <details>
           <summary>Title 1</summary>
           <p>Content 1 Content 1 Content 1 Content 1 Content 1</p>
         </details>

Hotkey

Hotkey:

⌘F

⇧⌘F

Markup : <kbd>⌘F</kbd>

Hotkey list:

Key Symbol
Option ⌥
Control ⌃
Command ⌘
Shift ⇧
Caps Lock ⇪
Tab ⇥
Esc ⎋
Power ⌽
Return ↩
Delete ⌫
Up ↑
Down ↓
Left ←
Right →

Emoji

Emoji:

:exclamation: Use emoji icons to enhance text. :+1: Look up emoji codes at emoji-cheat-sheet.com

Markup : Code appears between colons :EMOJICODE:

Standard HTML

Markdown was originally designed for HTML authoring, and permits raw HTML anywhere, anytime. As such, the most straightforward solution is simply to use HTML with the desired attributes:

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<h3>HTML</h3>
<p> Some HTML code here </p>
<font color="red">This is some text!</font>

Forked from markdown-cheatsheet