When using the Pure & Simple theme with a portfolio, you will want to check out the Portfolio custom content type that is part of the Jetpack’s plugin package. Although this is considered to be optional, I’ve provided you with styling if you decide to use the Jetpack portfolio option. This portfolio you see is using the portfolio shortcode which gives you several display options, including columns, showing more post details, and even choose how many projects to display.
[portfolio display_types=false display_tags=false columns=3 showposts=9]
