If most of your backlinks come from sites with high trust flow metrics, your SEO rankings will improve, you will have a high PR and link acquisition will become easier. Use Majestic to analyze the links that currently point to your site. Input the root domain into the box and click the search icon.

Quality Backlinks means the link from the High page rank sites with Dofollow.

I think forums are best for backlinks

1. Forum Posting
2. Info-Graphics Submission
2. Guest Blogging
4. Article Sharing
5. Blog Creation and Sharing
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Focus to get back links from high page rank websites. This is quality back links.

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