Link building is necessary to get a site indexed and ranked highly by search engines. It involves getting other sites to link to your site and can be done in-house for free or through a professional agency for a cost, but is always time consuming. The suggested approach is to partner with quality sites and keep links in place for a long enough time period while following NextBee's unique link building methods. Additional considerations include optimizing a site internally and using NextBee's referral and review tools to help with link building.