1. The document discusses 7 of the worst SEO habits, including obsessively tracking traffic, using paid links, focusing too much on keyword density, submitting many low-quality articles to directories, checking rankings too often, using article spinning, and outdated tactics. 2. Paid links and low-quality spun content are discouraged as Google prefers original content and doesn't favor paid links. 3. It's better to focus on quality content, some target keyword optimization, occasional ranking checks, and more effective strategies rather than outdated tactics like heavy article submission or spinning.