Hello I am new to SEO I want to know that what is the SEO Strategies and how does it work.....

SEO is basically Search Engine Optimization. The goal of SEO is to get your pages ranked on the search engines. There are various recommendations that you can immediately start working on to get your website's pages closer to the top of searches.

I would start by reading Google's document:

Search Engine Optimization Starter Guide

I agree with you and the link you mention in your thread is so good I read it.

According to me just create quality backlinks using updated content.

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