You know i'm Chinese and i have a online shop,but now i found i do not know which keyword is suit for my products, when i search the result of the one keyword,i found so many China competitors at here,and some of they said when his site at the top of google ,it could not take him too many traffic,so i do not know which one is our keyword.You know the habbit of us is different,so i do not know what should i do. Anyone can help me?
First you should analysis your competitor's site through that you can get idea for keywords. After that for finalize your keywords you can use different types of keyword suggestion tool like google adwords keyword tool, google insight for search. It will very helpful for you.
free keyword tools from seobook works well for me. check it here http://tools.seobook.com/keyword-tools/seobook/
Maybe you should pick another niche to get into? I see people asking questions like this all the time, and most of the time they do not know anything about the topic of the website. Most of them picked the topic of the site just because they think they can make money off of it. How much do you actually know about the products your trying to sell? If you knew a lot about them, then you would not be having to ask what the best keywords are. Most of the people that know the topics, they usually know the trends, whats hot and whats not and keywords.
Also there are some more free tools. Just go to google.com and search keyword tools you will find a list.
You can choose that keyword which you think easily indexed by the google and that keyword get lots of searches. Also make use of the some web master tools to get better look for the keywords.