Google Keyword planner is the best way to search keyword according the services or products. you can find the keyword easily in the google,always use the keyword that people will search largely in the SERP.
Your keyword must be relevant to your business and should be in such manner that user enters those keyword to find your website. There are many tools you can find to keyword research. Google keyword planner tool is best for keyword research.
Google Keyword Planner and Google Adwords are the best tools used for the keyword research. By utilizing this tools , you will able to find the keyword which is the best fit for your website.