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There are some ways to discover keywords about your website:
Use good tools for keyword search, consult to other peoples who knows more, Use online forums etc...

If you want to find best keyword for your website then you can use google keyword planner tool. It's tool provide best keywords.

You should do keyword research for that, you can get a research tool from SEOclerks.

Use Google keyword planner..

Google Keyword Planer is Best, i always USE it.

I am using google keyword tool. And it's best tool for finiding keyword. So you try it and get nice result.