Have you ever think of why Google disclose SEO resource? Why Google keep advise people create fresh content, anchor text help improve ranking, install GA and webmaster tool? Below are my view point: 1. Millions of fresh content born daily, it make user must relied on Google search to reach the targeted site. 2. Anchor text, it increase keywords competition, high keywords competition make adwords PPC program more valuable. 3. install GA and webmaster tool, it help Google well analysis site traffic in and out and user habit. 4. Google webmaster blog, so all webmaster can follow their guide to improve Google search. What do you think?