What are 404 code elements and how can they be fixed on a website?

Store Design
1

Hey! Shows elements with code 404 in the console of my website. What are these elements and how can I fix it?

Снимок экрана 2021-11-30 в 13.37.52.png
Снимок экрана 2021-11-30 в 13.37.52.png1500×130 32.5 KB

https://imaara.co.uk/%7B%7Bfeatured_image%7D%7D

https://imaara.co.uk/pages/%7B%7Bfeatured_image%7D%7D

https://imaara.co.uk/blogs/%7B%7Bfeatured_image%7D%7D

https://imaara.co.uk/pages/%7B%7Bfeatured_image%7D%7D

https://imaara.co.uk/blogs/news/%7B%7Bfeatured_image%7D%7D

https://imaara.co.uk/collections/%7B%7Bfeatured_image%7D%7D

https://imaara.co.uk/blogs/news/%7B%7Bfeatured_image%7D%7D

https://imaara.co.uk/pages/%7B%7Bfeatured_image%7D%7D

https://imaara.co.uk/blogs/news/%7B%7Bfeatured_image%7D%7D

https://imaara.co.uk/pages/%7B%7Bfeatured_image%7D%7D

https://imaara.co.uk/pages/%7B%7Bfeatured_image%7D%7D

https://imaara.co.uk/pages/%7B%7Bfeatured_image%7D%7D

https://imaara.co.uk/pages/%7B%7Bfeatured_image%7D%7D

https://imaara.co.uk/pages/%7B%7Bfeatured_image%7D%7D

https://imaara.co.uk/pages/%7B%7Bfeatured_image%7D%7D

https://imaara.co.uk/pages/%7B%7Bfeatured_image%7D%7D

https://imaara.co.uk/pages/%7B%7Bfeatured_image%7D%7D

https://imaara.co.uk/pages/%7B%7Bfeatured_image%7D%7D

https://imaara.co.uk/collections/%7B%7Bfeatured_image%7D%7D

https://imaara.co.uk/collections/%7B%7Bfeatured_image%7D%7D

https://imaara.co.uk/collections/%7B%7Bfeatured_image%7D%7D