Slider Thumbnail Size Issue [closed]

You are on a good track.

  1. You first define your thumbnail sizes in your functions.php
  2. Make you upload big high-quality images but still good enough for the web
  3. You then need to regenerate your thumbnail, I recommend this plugin: https://wordpress.org/plugins/regenerate-thumbnails/
  4. In you new code, you need to call your desired thumbnail based on the size you have provided, e.g. <?php get_the_post_thumbnail( $post_id, 'my-slider-img' ); ?>

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