Option 1: Export from SketchUp to OBJ, DAE or FBX
In SketchUp, use File → Export → 3D Model, pick OBJ, DAE (Collada) or FBX, then import that file in Blender. This needs SketchUp Pro for some formats, and materials or texture paths are often lost along the way.
Option 2: Use a SketchUp importer add-on
Community add-ons let Blender read .skp files. They work for some file versions, but must be installed manually and often break after Blender or SketchUp updates.
Option 3: Convert SKP to BLEND online (fastest)
Upload your .skp file to the converter above and download a ready-to-open .blend file. No SketchUp, no add-on, materials preserved.
Need the opposite? Convert Blender files back to SketchUp with the same tool.