What is Markdown?

Markdown is a lightweight markup language for creating formatted text using a plain-text editor. Markdown is the easy to use syntax for styling the plain text on the GitHub platform.
You can use Markdown in most places around GitHub:-

• GitHub repo readme.md file
• Gist
• Comments in issues and pull requests
• Files with .md or .markdown extensions

Syntax Guide

Markdown also require some syntax specifications to write it !
Let's check what it is.

Header

• # h1
• ## h2
• ### h3
• #### h4
• ##### h5
• ###### h6

The heading is preceded by a '#' symbol 1 '#' marks symbolizes h1 and 2,3,4,5 '#' symbols indicates h1-h6 .Just make sure you have a space following them (after the '#' symbol).

I am h1 preceded by 1 # symbol.

I am h2 preceded by 2 # symbols.

I am h3 preceded by 3 # symbols.

I am h4 preceded by 4 # symbols.

I am h5 preceded by 5 # symbols.

I am h5 preceded by 5 # symbols.

Emphasis

Emphasis aka italics with *asterisks* or _underscores_.
Strong Emphasis aka Bold with **Double asterisks** or __double underscores__.
Combined emphasis with **asterisks and _underscores_**.
Strike Through with 2 tildes ~~Strike This~~.

Emphasis aka italics with asterisks or underscores.
Strong Emphasis aka Bold with Double asterisks or double underscores.
Combined emphasis with asterisks and underscores.
Strike Through with 2 tildes Strike This.

Lists

#### Ordered list
1. First ordered list item
2. Second ordered list item
  1. First ordered intended list item
  2. Second ordered intended list item

#### Unordered list 
- First unordered list item.
- Second unordered list item.
  - First intended unordered list item.
  - Second intended unordered list item.

Some more ways to write unordered list .
* Unordered list can use a asterisks '*'.
- a minus.
+ or a plus.

Ordered list

1. First ordered list item.
2. Second ordered list item.
   1. First ordered intended list item.
   2. Second ordered intended list item.

Unordered list.

• First unordered list item.
• Second unordered list item.
  • First intended unordered list item.
  • Second intended unordered list item.

Some more ways to write unordered list.

• Unordered list can use a asterisks '*'.
• a minus.
• or a plus.