Quality backlinks can be generated by do guest posting on various niche relevant blogs. This helps to build your keyword ranking in Google and also helps to redirect traffic to your website from various external domains.
There are some ways to build backlinks:
+ Forum Posting (relevant Forums)
+ Docs sharing
+ Video Submission
+ Social media submission
You should choose the websites that have high DA, PR. That helps you site rank increase.
7 Ways To Get Quality Backlinks
1. Article marketing
2. Social Networking Site Profile
3. Press Release
4. Link Exchange
5. Document Sharing Sites
6. Guest Blogging
7. Blog Commenting
For generating quality backlink there is only one way to got it. Whatever activity you are doing to do for getting backlinks just check 1st its DA and PA after that try to get backlinks. Always try get backlink from high DA & PA website that will called your quality backlinks.