It is highly recommended that you properly format your post before submitting it... To create your content on Steemit.com you can either use the "Editor" or "Markdown" mode... The following is a brief summary of some of the most common formatting commands available in Steemit Submit a Story Markdown window...

Large Text (Header 1)

 To create large text using the <h1> tag 

• Largest is # word, or <h1> word </h1>

 Bold

To make a word appear in bold font, use ** before and after the word.
You do NOT need to leave spaces between the ** and the word.
You can also use the <b> tag. 

• word : <b> word </b>

 Italics

To make a word appear in italics use a single * on each side of the word.
You do NOT need to leave spaces between the * and the word.
You can also use the <em> tag...

• word : <em>word</em>

 Link

To link a website to a word or phrase in your post,, use [ ] and ( )...
The text goes in the [ ] and the link goes in the ( )

• [word or phrase](website.com)

If you are not using the markdown editor, you can also create a link this way

• <a href="https://website.com">name of website</a>

 Center Pictures, Videos, or Text

To center the picture use <center> and </center>

• <center>picture.jpg</center>

To center text use <center> and </center>

• <center> word </center>

To center a video use <center> and </center>

• <center> videolink </center>

 Captions

To make it appear that a picture has a caption, use the break feature, center feature and the italics feature. (Special thanks to @razvanelul for this cool idea)

• <br><center>picture.jpg</center>
  <center>*caption*</center><br> 

Collections from click here