thank you about your answer!

Hello,i am new at seo and i would like to ask a question about backlinks. I have seen many times backlinks at my competitors that there is a page .html which links to an image like this for example: this site benoitsimian.fr/μεταφορα-κουζινασ-σε-αλλο-δωματιο-k.html is linking to this site Ανακαίνιση κουζίνας - Τιμές και εργασίες της ανακαίνισης κουζίνασ IMAGE kataskevazein.gr/wp-content/uploads/2018/02/kitchen-1543489_1920-768x419.jpg

Could someone tell how to create these backlinks ?