Hello friends,

Which is best Link Building technique ..?

We have so many link building techniques in SEO, some are mentioned in below:
1. Article submissions.
2. Blog posting & commenting.
3. Press release submission.
4. Question & answers submission.
5. Classified submissions.
6. Social bookmarking.
7. Local listing.

There are so many link building techniques, but be careful in posting and sending your link using these techniques.

Directory Submission
Article Submission
Press Release Submission
Blog Posting and Blog Commenting
Social bookmarking
Classified Submissions
Local Listing
Guest Posting

Make sure that you are sending your website on different high quality and trusted site/s and posting unique and fresh content.

- Ask for backlinks
- Build relationships
- Give a testimonial
- Start a blog
- List your site in trustworthy directories
- Write a good guest post
- Advanced link building tips
- Discover competitors' common backlinks
- Get an indirect backlink from your competitor
- Recover your dead backlinks
- Turn your mentions into backlinks
- Find the strongest competitors healthy backlinks
- Find the most relevant link building opportunities
- Be aware of your competitor's new links
- Launch a "Scholarship" contest or a giveaway campaign
- Earn your links!
- Infographics
- Lists
- Research reports and case studies
- Newsletter subscriptions
- Extra material
- Learn from others

Link building is still one of the best SEO techniques. I would like to share here a list of link building techniques which still work in 2017:
- Guest posts is still an effective technique. But you should do it right, create and maintain relationships with industry news sources and blogs, produce high-quality content and make sure that you link back to your site in a useful and relevant way;
- Blogging, which is a unique way for a company to engage their audience , attract links and achieve higher organic rankings;
- Infographics;
- Directories link building technique still works, but you need to be mindful with how to approach it. Directory link building requires judgement and critical thinking! so do not be tempted by low-quality directories, they will cause you more damage than good.
- Asking for links is still an original and trusted technique that still works.

I hope this helps.

As per my experience,

Outreach
Business Listing
Profile creation on best site
social media marketing
Blog Submission
Article Submission
Guest Posting

The best link building techniques are:

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

Guest Posting
Forums
Blog commenting
Local Listing
Press Release

list of some link building practices which online marketing experts use:
Articles
Product review
Make interviews
Question Answers
Infographics
Video marketing
Podcasts
Free tools
Pinterest
For more: https://www.solwininfotech.com/blog/seo/uncomman-link-building-techniques/

Social bookmarking 
article submissions
commenting.
Blog posting
press release submission.
forums link

Here are the link building techniques you can use:
- Forum Posting on relevant niche
- Guest Post
- Business Listing
- Classified Ads
- Image, Document, Article Sharing etc.

1. Internal Links
2. "2017" Jacking
3. Local Business Citations
4. Building Links from Trusted Sites
5. Scoop.it