You can control your post style with 'Post Format' option. Seosight theme supports most common WordPress post formats, you can read about them here: https://codex.wordpress.org/Post_Formats
To choose of what format will be your post, just select desired one from the radio-button list and start filling the content
Let's overview all post formats represented in the theme:
Use it to create a simple post with regular style. It is default post format and no ordinary options required.
More about a blog post creation you can read here:
Displays video player on your blog and post page.
Just add the link to YouTube or Vimeo video in appeared Video post options:
Displays audio player on your blog /category/ post page.
Enter link for audio that will be embedded
Displays a quote block on a blog archive page.
Add a quote in a visual/text editor and fill in the fields appeared after quote post activation
Allows to show post linked to another page/site.
To create link post, add the text you want to be displayed on blog into text editor and wrap it with the link
