How to configure the Portfolio in Zerif Pro
Zerif Pro is having the feature of Portfolio section on the website which looks like this:
First, you need to make sure that it's enabled from Appearance > Customize > Portfolio section.
If it is, then you need to navigate back to your Dashboard and add some items to your Portfolio. To add images in Portfolio, Go to WP-admin > Portfolio > Add new. And make sure that you've added a Featured Image to your Portfolio item. If there isn't a Featured Image then it won't appear on the front page.
There should be, at least, one portfolio item, in order for the Portfolio section to show up.