I notice on some sites, they have a section on the bottom where it says "tags: a ,b, c, d, e, f, g, etc..." should I add this to my site and will it improve or help to target specific adsense keywords? Thanks!
Yes tags will help, but tags should be keywords which are linked to the post related or other content. Having null or no linked keywords will get you penalized by google.
Ok so if Im understanding this correctly, I have a given page that has soap tutorials, I can add a section on the bottom that says tags: soap tutorials, how to make scented soap, etc but I cant add something like tags: soap tutorials, how to make scented soap, mesothelioma (lol) <--- penalized! It has to be related to the content of that given page. (and site for that matter)