If you look around the Marketing section, you’ll find we have active discussions on these issues, which will probably answer most, if not all, of your questions.
For example:
Link building in 2016
Which seo technique is best to create back links?
https://www.sitepoint.com/community/t/how-can-i-improve-my-ranking/225708
https://www.sitepoint.com/community/t/learning-seo-the-right-way/225378