In this tutorial I share how to set up a grid of 3-columns (can be 2 or 4 or 5 or 6 columns) showing the featured images of Portfolio Post Type entries with a black & white turning to color effect for the images on hover.
Install and activate Portfolio Post Type plugin.
In the WP admin, navigate to Portfolio > Add New Item and enter your Portfolio entries. Make sure to set a Featured Image for each item.
Add the following in child theme's functions.php:
Create a file named archive-portfolio.php having the following:
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