Carefully select the title for each page of your website. In many cases, you will want the title to be different from that of your home page searches can and will zero on a particular page of your site. If you maximize the performance of each page of your site, you will maximize the number of hits you get overall.
If you are using wordpress, all the above applies and in addition, you have the opportunity to explicitly select tags. These are key words that you yourself define. They are set in the lower right hand of your page or post while you are in edit mode.