Best SEO techniques for 2016

Fresh Content is the best because content is the king in SEO, but your content must be unique and different. Try to publish quality content two or three times in a week.

Content plays an important part in SEO, more unique and quality content you have on your website more better rankings you can achieve. As we know Google has number of guidelines those are mainly developed for content.

Quality keyword-targeted content is the basis of your SEO. However, I think the trickiest part nowadays is the off-page link building.
If you have the will and the know-how, you can easily produce killer content by being VERY informed or creating something truly original (gather your own data through surveys, studies, etc.)
With link-building, your best bet would be to guest-post in relevant niches. You have to do the same thing (provide quality content), except it has to be tailored to the audience of the site you guest-post to.
Also, be VERY careful on how you pitch sites for guest posts because most quality blogs (especially the ones that specify that they do accept guest posts) get bombarded with hundreds of requests. Try and make yours stand out from the rest.

And, last but not least, play by Google's rules!

Fresh, Unique and Quality Content is best, because content is the king in SEO. Your content must be unique and relevant to your website. Try to create good content with backlink and submit it on high quality sites.

Having good quality backlinks helps in better driving of traffic to your site, which gains better site ranking. Also practicing effective On-Page SEO techniques helps to make your website SEO- friendly. SEO-friendly sites gain better search engine ranking.