add image sizes inside after_theme_setup
Allow featured imagess:
<?php add_theme_support( 'post-thumbnails' );
setting up additional image sizes (only use if required in the site otherwise creates server bloat)
<?php add_image_size( 'gomo-hero', 1600, 800, true ); add_image_size( 'gomo-four-by-three', 800, 600, true ); add_image_size( 'gomo-square', 800, 800, true );
In the WordPress admin area under > settings > media, you may want to set medium and large image size to ‘0’ if you are using custom sizes in the functions file.