This short tutorial should stop you from accidentally replacing your production database with an incorrectly ordered drush sql-sync command. Most website developers working to deadlines need to be protected from themselves! Try explaining to a client that their site of many years now contains dummy content.
Intermediate drush tutorial - Part 3
Follow the google animals
SEO or Search Engine Optimization has experienced substantial changes over the past number of years. Recently, Google has upgraded its algorithm numerous times, with interesting named algorithms, such as Penguin, Panda and Pigeon!