Link building is the practice of promoting your website by sending external links to the other websites.It is one of the many tactics used in search engine optimization.
There are a number of link building strategies, Some of them are:
Content Creation & Promotion – Create content that people willing to reference and link to, and tell people about it.
Submissions – Submit your links to press releases, submit your site to directories, etc.
Reviews & Mentions – Advertise your product, service, or site in front of influential bloggers.
Links from Friends & Partners – Get people you know and people you work with to link to your site.