Another more powerful method is to put the desired tag-words in a meta statement:
No. Its not. That was true in the 90's... but not today.
Don't waste your time trying to play the "Search Engine Optimisation" game with Google.
Google's modus operandi is natural search and as such they tailor their crawling algorithms accordingly, as per the following Google Blog entry :
“Search results, like warm cookies right out of the oven or cool refreshing fruit on a hot summer’s day, are best when they’re fresh. Even if you don’t specify it in your search, you probably want search results that are relevant and recent. If I search for [olympics], I probably want information about next summer’s upcoming Olympics, not the 1900 Summer Olympics.” Google Official Blog, Nov 3rd, 2011.
The more un-natural you make your website, the more you try to artificially pad it up, the lower you'll end up in the rankings. Their algorithm will just consider you a spammer and punish you accordingly.
The correct answer is to follow their published Webmaster Guidelines
here.
For background reading, start off by sticking "
Google PageRank", "
Google Panda" and "
Google Caffeine" into your favourite search engine.