Is Guest Posting only way to get Quality Links?

[Brackwom]

Guest blogging is still the best link-building approach in terms of link quality. Guest blogging gives you the opportunity to target high-quality websites and increase your chances of obtaining backlinks. However, guest blogging isn't the only way to build links. Backlinking can be done in a variety of ways.

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Copy the SEO backlinks of your competition. 
Make use of the broken link method.
Attempt to reclaim any lost backlinks.
Use images to create links.
Make contact with other specialists in the field.