in writting ads that attract costumer, choosing the rightful keywords play some enssential role. there are some tips for choosing a keyword. 1. use keywords b/w 2-3 words. 2. use Negative keywords. like expressing any offers. words such as discount, cheap, organic etc before a keyword. for example if your keyword happens to be ballet shoe, negative keyword expression for Discount, will be "Discount ballet shoe, or cheap shoe etc. 3. Use the keyword tools.
The best KEYWORD RESEARCH TOOL for AdWords and SEO available today is this - http://bit.ly/1OdLaSk
how can you know that you have choose the right keyword?
The key words can be very confusing. However, goggle uses key words tool which aids a business out tons.
Relevant keywords will make it more interesting to customers.., and use the keyword tool to discover new keywords