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Markdown
To my knowledge is a tool used for editing as such hackmd.io

Markdown is a superset of HTML, any HTML file is valid Markdown. That means you can use all the features of HTML to add tables and other elements to your Markdown documents. At the same time, you don't have to use HTML; you can just keep it simple and readable.
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And due to the approval of markdown used in Steemit website it allows ones work to be beautified.

Basic Markdown

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Discussion:
You can use symbols around text which you wish to modify. So,

For Italics, you use 1 asterisk () in front of the desired italic section, and 1 asterisk () at the end. You can also use 1 underlines (_) in the place of an asterisk.

Italicized Statement
Italicized Statement

Italicized Statement

For bold, you use 2 asterisks (**) in front of the desired italic section, and 2 asterisks at the end. Again, you can also use 2 underlines ( __) in the place of the asterisks.

Bold Statement
Bold Statement

Bold Statement

To put a line through the text, surround it with two Tildas (~~)

Striked Statement
Striked Statement

For Headers
You use up to 6 "#s" with 1"#" being the largest header, and 6 "#s" being the smallest.

Heading 1

Heading 2

Heading 3

Heading 4

Heading 5

Heading 6

Heading 1
Heading 2
Heading 3
Heading 4
Heading 5
Heading 6

For a bullet list, use an asterisk (*) or a dash (-) followed by a space in front of each item.

• 1
• 2
• 3

• 4
• 5
• 6

1
2
3
4
5
6
For a block quote, use a > at the beginning of the line. It is always safest to use block quotes when quoting to avoid confusion (especially in voting bots) in regards to plagiarism.

More advanced concepts.
For a hyperlink, encase the desired clickable text in brackets and immediately follow the brackets with parenthesis encasing the link.

sample
sample

Also, if you put an @ sign before a username, it will automatically add a hyperlink to that user's blog. For instance, check out @remlaps or @remlaps-lite

To make a table, use the following format (example from the markdown guide provided on Steemit):

First Header	Second Header
Content from cell 1	Content from cell 2
Content in the first column	Content in the second column
etc	etc

A sample would be

NFL MLB
Eagles Phillies
Cowboys Rangers
etc etc
In order to add an image, use the Steemit upload feature, or copy the image in manually. You will get a link.
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Conclusion
And that is all I learnt about #Markdown.