There are two types of SEO Activities.
1) Off page.
2) On Page.
On Page : " On page seo refer to the designing your website in a search engine friendly way.for example changing the title of your website,description,keywords,and use the heading tag."
Off Page: " Off-page optimizations are activities to promote and popularize our website. In general, this means creating backlinks to the website. The number and quality of backlinks defines the relevance or importance of particular web page."
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Click Here For Off page