Content marketing is the best way to create quality back links. You can follow the below content marketing strategies to earn links from high authority and quality websites.

1. Provide Free Stuff – “Free” is a magical word that attract the bloggers as well as the users. Publish the free stuffs or resources and outreach them to the relevant websites. For example, if you are running a website which deals in web design and development, then you can publish the free resources like design PSD, UI kits, mockups etc.
2. Create Useful and Rich Content – Great way to build quality links. If your website is publishing the quality content on regular basis, then it surely will help you to earn links.
3. Guest Posting – Don’t do it in bulk, do it only on relevant and high authority websites only. Create a guest post relevant to your field and outreach them to the quality websites.
4. Publish free e-books, presentation and How-to guides – This type of content ie really helpful. Prepare e-books, presentation and complete guides on the relevant topic.