This is a really good blog to read. SEO stands for search engine optimisation. Search engine optimisation involves a step by step process of online optimisation strategies. We do SEO on our site to increase the visitors. This can be done by gaining a high-ranking placement in the search results page of a search engine (SERP). These include Google, Bing, Yahoo! and other search engines. There are many processes we can do on how your site can get in the top search results. On this blog, they have listed important SEO tools here. These 21 best free SEO tools are readily available online which we can use as our guide to optimise our site/s. Check on these tools to know and familiarise the tools to do SEO. I appreciate the author of the blog for sharing this list of SEO tools. This is worth to read.