It increases website visibility, user traffic, conversion rate, and ROI. Only write for highly reputable websites in your niche. Don't waste time writing for websites with a Domain Authority level lower than that of your site. Your link will have very little value, and you might end up having your link removed without further notice. As a rule, from a single page or piece of content, a user should be able to jump to any location on your site. Search Engines also take into account domain name age and whether or not a site is stagnant (no new content being added regularly). As a result, Google has put great effort into knowing when an inbound link is from a quality, trust-worthy site, versus a fabricated link purely for manipulative gain. The former helps you. The latter hurts you.