Before we do, I need to point out that, even though I will show that these search engine optimization techniques and methods are perfectly harmless, ethical and sensible, some engines don't want some of them to be used and, if they spot them being used, they may penalize the page or even the whole site. Pages and sites are not often penalized. It depends on the nature of the 'offense'. Generally speaking, search engines are down an anything that adversely affects their surfers.

I should also say that search engines are very poor at spotting unwanted techniques and rely on people reporting them. Whether or not you choose to use any of the techniques is up to you but, if you do, it would be wise to hide them from people and not talk openly about them unless you can talk anonymously.