Google is likely the most powerful search engine on the planet. Google is also very secretive about how its search engine ranks sites. Rather than explaining how they rank sites, they give guidelines for optimizing your site to perform in their search engines. Answer the following:

1. Explain one of the techniques that should be avoided. Please explain in detail what the technique/guideline means.
2. Why do you think that Google does not allow this technique?
3. Explain the most critical guideline that you recommend a website should follow and explain why.