How do I get free quality backlinks to improve page and domain authority?

Go to Google and Search for –

  1. High PR DoFollow Directory Submission Sites
  2. High PR DoFollow Social Bookmarking Sites
  3. High PR DoFollow <niche > Blogs
  4. High PR DoFollow Profile Creation Sites
  5. High PR DoFollow PDF Submission Sites
  6. High PR DoFollow PPT Submission Sites
  7. High PR DoFollow Classifieds <location> Submission Sites for local SEO
  8. High PR DoFollow Article Submission Sites
  9. High PR DoFollow Press Release Submission Sites
  10. High PR DoFollow Video Submission Sites
  11. High PR DoFollow Business Listing Submission Sites

People have already researched and put the above in their blogs. Go and utilize them. Remember SEO is a marathon and not a sprint and it takes a while to generate results.