keyword search

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Can someone please explain me what is SEO Keyword Research and SEO Keywords? What are the uses for these ? What are the tools needed to do SEO keyword researching ? Are there free options ?

Guys, its just me or keyword revealer free trial don't shows keyword suggestions anymore? when i go on keyword tool and search for a keyword, the only result is the keyword i searched

I need to contact domains that contain certain keyword. Once I get those domains, if they meet my criteria, I wish to offer them my products and services via email. For example, domains that contain city name. Let's say Boston. What is the best way to find these types of domains?