For example, if you sell wedding gowns, also think about other things and words related to weddings, such as honeymoon, bridal registry, wedding rings, engagements, and other wedding accessories and services. The idea here is to capture people who may be looking for other things related to weddings, whether they are directly looking for wedding gowns or not at the time. Chances are that someone looking for any wedding related information will also be interested in knowing about wedding gowns. This is a very powerful way of getting more targeted traffic to your site. Do not forget misspelled words.
People often misspell words when they enter their search terms.
Include commonly misspelled words or phrases as part of your list. If your site deals with a particular region, remember to include that in your keyword list. E.g. 'Los Angeles wedding gowns' if you deal in wedding gowns within Los Angeles. Use the long and short form of words, e.g. consult, consulting, and consultants. Do not use keywords that have nothing to do with your web site.