What are the Best SEO techniques to use in 2015?

Optimize your web site page around one topic with limited keywords
Create Responsive Websites design.
Website should bearing an https extension
URL structure should be short, descriptive & help to categorize your website.
Abundant Content with a Focus on Graphics
Optimize page titles
Utilize proper heading tags
Optimize image alt text
Grow natural links
Increase site speed
Audit your site framework
Putting into Practice Schema .org and Appropriate Meta Tag Utilization
Go for quality link building and content marketing