There are a number of SEO techniques that have been used over the years that you need to avoid completely. Amazingly, people continue to recommend several of these techniques. In many cases, there is no faster way to get a Google penalty.
In the past one thing that worked amazingly well was keyword stuffing. In keyword stuffing you put your chosen keyword onto your page as many times as possible. The concept behind keyword stuffing was recognition that Google’s program would see repetitions of the keyword as a prime factor in determining how relevant that page was to that keyword. After all, if having some references to the keyword was good then more would be better.