Use the Google Keyword AdWords Tool that analysis the keyword. Using google AdWords tool choose the various keyword according to website and in this tool my aim is great search volume with lower competition. But seo firms use keyword AdWords tool because this tool is free.
It is very important to find keyword for your site .you can use googleadwords tools for this put your site url and find the related keyword.Keywords that are low cocompition and high traffic are very useful
Google adword is the best keywords research tool.It provides youthe complete information of a lot of keywords with their competition and global searching as well,so that you can choose that one have less competition and more searching.