To ensure they are constantly delivering the most relevant and helpful content to people using their search facility, Google change their algorithm hundreds of time per year. With every impending update comes the opportunity for Google to reduce your websites ranking or remove you from the index completely.
The infographic below from Attach Media shows you some differences between good and bad SEO practices. Follow the 6 good steps to ensure your site isn’t penalised. Or, if you fancy a Google penalty, follow the 6 on the bad side.