This plugin is considered essential by many designers because SketchUp lacks a native tool to quickly round off edges for realistic rendering.
The interface can look intimidating for beginners, and you need to install "LibFredo6" (a free library) first. bevel plugin sketchup free download
SketchUp works on flat planes and sharp edges. A bevel (chamfer) or fillet (rounded edge) requires creating new geometry that flows around a corner. Doing this manually takes hours of push/pull on intersecting faces. This plugin is considered essential by many designers