Is Google Analytics (GA) a complicated analytics tool? No, not at all - If you start with using these 7 reports. The 7 reports would give you a really good idea of what has been happening with any website.
All Traffic Sources (Referers)
Landing Pages (Entry points)
Location (Country, Region, City)
Funnel Visualization - Visualize conversion path, and drop-off points (where abandonment occurs)
Device Category (Desktop, Tablet, Mobile)
Visitor Types (New Visitors vs Returning Visitors)
Screen Resolution
In this video, I've explained the GA reports: