While trying to find out anything about keywords and competitor,I didnt know anything really .. any starter information about them ?
competitor is a website that is relevant in content and theme with your site. For example, if you have a website about 'blue widgets', you should search on Google for 'blue widgets' and the sites that come up in the results are your competition. See the keywords they are using in their web pages and also use the keyword tracker tool like weblaunch mentioned above to find more keywords related to your niche.