The more website visitors you have, the more complicated it can be to analyze your Google Analytics traffic and data. A common issue I have seen with many clients is the ability to properly attribute certain campaigns to visits and website activity. This typically isn't because offsite, inbound marketing efforts are bad, but because the actual tagging of inbound links is incomplete and thus "hidden" in Google Analytics labeled under either direct visits, organic, or simply from a referring site. Links to your site can be configured to send specific source, medium and campaign information into Google Analytics and allow for better, more detailed reporting. To do this, you'll need to tag your URLs.