Rel=Canonical

1. 301 vs Canonical

1.1. Basics... How and When to Use 301 Redirects vs. Canonical | Search Engine Watch

1.2. redirct instad of.... 301 Redirect or Rel=Canonical - Which One Should You Use?

2. DOS and DONT

2.1. A/B testing: How to Run your First A/B Experiment for Free Using Google Content Experiments

2.2. WRONG WAY! Catastrophic Canonicalization

3. Experiments

3.1. Canonical and noindex: The Canonical Experiment: rel=canonical and robots=noindex combined - Search Mythology

3.2. Better ranking with...; better rankings with canonical tag?

4. Guides

4.1. Basics..again.. Complete Guide to Rel Canonical - How To and Why (Not)

4.2. Google point of view... Use canonical URLs - Search Console Help