As well as receiving links from others, it is also important to link to relevant sites when

One of Google’s more mature algorithms, Hilltop, lets the search engine know when pages are “hubs” of information. Even though the Hilltop algorithm is over ten years old, it has been proven to be still prominent in SEO arena by a recent study on outbound and inbound links.

Hilltop decides if a page is a hub of information by measuring the number of relevant, quality outbound links on the page. So, if you link out to other useful sources, instead of just linking to your own stuff, your page will be seen as a hub of information in your industry, and it will climb up the search rankings.