Search engine optimization is the process of increasing the quality and quantity of website traffic by increasing the visibility of a website or a web page to users of a web search engine. SEO refers to the improvement of unpaid results, and excludes direct traffic/visitors and the purchase of paid placement.
If your rankings and organic traffic is increasing, then this means that you are in the right direction.
On-Page SEO has to do primarily with the content and other elements found on a page
Backlinks are a signal of trust and depending from where the links are coming, they can greatly affect your ranking position.
Website analytics is the measurement, collection, analysis and reporting of web data for purposes of understanding and optimizing web usage.However, Website analytics is not just a process for measuring website traffic but can be used as a tool for business and market research, and to assess and improve the effectiveness of a website. It helps one to estimate how traffic to a website changes after the launch of a new advertising campaign.