How can I get a free high quality backlink?

[mediadrug]

Free high quality backlinks can be generated using various off page techniques like:

Guest posting
Article submission
Press release submission
Social bookmarks
Classified ads
Infographics submission

To get high-quality backlink you can do following off-page process:
Article Submission
Guest Posting
Blog Commenting
Social Bookmarking
Directory Submission

There are so many method to get high quality backlink:
Article Submission
Guest Posting
Blog Submission
Video Promotion
Blog Commenting
Forum Posting

These are obsolete techniques. Where do you guys find ideas which are so 10 years old? All these methods are ineffective for more than 5 years.

Only viable technique which you guys stated is guest posting and nothing else.