On page SEO: This involves improving your website’s search engine rankings and earning organic traffic by publishing relevant, high-quality content. The tasks include optimizing your headlines, HTML tags (title, meta, and header), and images with regard to your main keywords and main website goals.

Off page SEO: Refers to actions taken outside of your own website to impact your rankings within search engine results. Off-site ranking factors involve improving the search engines' and users' perceptions of popularity, relevance, and authority of a site. You accomplish this by having other reputable sites link to or promote your website. 

Technical SEO: Refers to website and server optimizations that help search engine spiders crawl and index your site more effectively . Some of the actionable tasks for Technical SEO include adding metatags, minifying the website’s code, removing render blocking, converting images to next gen and also optimizing the website’s speed.