Backlinks are an important part of off-site SEO. For example, suppose multiple trusted sites refer to your page via backlinks. In that case, the search engine can infer that your page's content has valuable content, and there is the possibility of ranking your page on the search engine result pages. It also creates a good image in users' minds so that most users want to receive your site.

you can create backlinks in multiple ways like

1. outreach
2. Guest posting
3. Forum posting etc.