High quality back links are made by having back links from high page rank websites

mostly my views already explained here..
keep going guys

by social bookmarking, article and blog submission, pdf and ppt submission

Yep you marked some good points! Thumbs up

Implementation of SEO and SMO techniques can create more backlinks to the website.

Build backlinks in high PR sites with quality and interesting content

Get backlinks from high domain authority sites. Famous bloggers have high DA sites. Write to them & ask if they're willing to feature you.

How to get the quality backlink?
 

Link exchange.
article marketing.
Guest Blogging
Commenting.

How to do high-quality back links?
 

article marketing.
press release
link exchange
document exchange sites
guest blogging
commenting

Depends on high-quality back/

Very good tips. Thank you

Stick to guest posting but be careful to choose quality sites.

There are many ways to create high quality backlinks such as:

Article
Blogging
Forums
Press Release
Bookmarking
Link Wheel
Classifieds

just follow the steps of off page seo and give out the quality things and there you will get the best quality links